MANAGEMENT's DISCUSSION AND ANALYSIS OF


                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis should be read in conjunction with our consolidated financial statements and related notes included elsewhere in this Annual Report. This discussion and analysis and other parts of this Annual Report contain forward-looking statements based upon current beliefs, plans and expectations that involve risks, uncertainties and assumptions, such as statements regarding our plans, objectives, expectations, intentions and projections. Our actual results and the timing of selected events could differ materially from those anticipated in these forward-looking statements as a result of several factors, including those set forth under "Risk Factors" and elsewhere in this Annual Report. You should carefully read the "Risk Factors" section of this Annual Report to gain an understanding of the important factors that could cause actual results to differ materially from our forward-looking statements. Please also see the section entitled "Cautionary Note Concerning Forward-Looking Statements." All amounts in this report are in U.S. dollars, unless otherwise noted.

Overview

We are a late-stage biopharmaceutical company focused on the discovery and development of novel anti-infectives. A significant focus of ours is on targeted immunotherapy using fully human monoclonal antibodies, or mAbs, to treat life-threatening infections. mAbs represent an innovative treatment approach that harnesses the human immune system to fight infections and are designed to overcome the deficiencies associated with current therapies, such as rise in drug resistance, short duration of response, limited tolerability, negative impact on the human microbiome, and lack of differentiation among the treatment alternatives. The majority of our product candidates are derived by employing our differentiated antibody discovery platforms. Our proprietary product pipeline comprises fully human mAbs targeting specific pathogens associated with life-threatening bacterial infections, primarily nosocomial pneumonia, and viral infections such as COVID-19.

Our ?PEX™ production platform technology enables the screening of a large number of antibody-producing B-cells from patients and generation of high mAb-producing mammalian production cell line at a speed not previously attainable. As a result, we can significantly reduce time for antibody discovery and manufacturing compared to conventional approaches. This technology is being applied to the development of COVID-19 mAbs.

In 2021, we announced the development of highly neutralizing monoclonal antibody cocktails AR-712 and AR-701, discovered from convalescent COVID-19 patients, that successfully eliminated all detectable SARS-CoV-2 virus in infected animals at substantially lower doses than parenterally administered (injected) COVID-19 mAbs. The mAb cocktails broadly bind and neutralize SAR-COV-2 virus and the mutant 'E484K' variant that is associated with the UK, South Africa, Brazil, and Japan strains. The AR-701 mAb cocktail exhibits broad neutralization to SARS-CoV-2, SARS, MERS, and several seasonal 'common cold' coronaviruses. We announced that AR-701 is replacing AR-712 as a clinical track program. The potency of AR-701 and its direct delivery to the lungs by inhaled administration may facilitate broader treatment coverage and dose sparing not achievable by parenteral administration. A clinical Phase 1/2 study is expected to be launched in the second half of 2022.

Our lead product candidate, AR-301 has exhibited promising preclinical data and clinical data from a Phase 1/2a clinical study in patients. AR-301 targets the alpha toxin produced by gram-positive bacteria Staphylococcus aureus, or S. aureus, a common pathogen associated with HAP and VAP. In contrast to other programs targeting S. aureus toxins, we are developing AR-301 as a treatment of pneumonia, rather than prevention of S. aureus colonized patients from progression to pneumonia. In January 2019, we initiated a Phase 3 pivotal trial evaluating AR-301 for the treatment of HAP and VAP. The on-going COVID-19 pandemic has and continues to cause an impact on patient enrollment globally and the rate of clinical site activation. We expect to report top line data from this trial in the second half of 2022.

To complement and diversify our portfolio of targeted mAbs, we are developing a broad spectrum small molecule non-antibiotic anti-infective agent gallium citrate (AR-501). AR-501 is being developed in collaboration with the Cystic Fibrosis Foundation ("CFF") as a chronic inhaled therapy to treat lung infections in cystic fibrosis patients. In 2018, AR-501 was granted Orphan Drug, Fast Track and Qualified Infectious Disease Product ("QIDP") designations by the Food and Drug Administration ("FDA"). During the third quarter of 2019, the European Medicines Agency ("EMA") granted the program Orphan Drug Designation. We initiated a Phase 1/2a clinical trial in December 2018 of the inhalable formulation of gallium citrate, which is being evaluated for the treatment of chronic lung



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infections associated with cystic fibrosis. In June 2020, we announced positive results from the Phase 1 portion of our Phase 1/2a clinical trial of AR-501 in which healthy subjects were enrolled. The Safety Monitoring Committee ("SMC') and Data Safety Monitoring Board ("DSMB") from the Cystic Fibrosis Foundation supported that the study proceed at all dose levels to the Phase 2a portion of the Phase 1/2a trial in adult subjects with cystic fibrosis ("CF"). We expect to complete enrollment in mid-2022 and announce top line results in mid-2022.

In July 2021, we announced an in-licensing agreement with MedImmune Limited, a wholly owned subsidiary of AstraZeneca, for the worldwide commercial rights of suvratoxumab, which is a half-life extended human IgG1 monoclonal antibody that also targets the alpha toxin produced by S. aureus. Suvratoxumab is a fully human, IgG1 monoclonal antibody targeting S. aureus alpha toxin. This product is given the product code 'AR-320'. As with AR-301, AR-320's mode of action is independent of the antibiotic resistance profile of S. aureus, and it is active against infections caused by both methicillin-resistant S. aureus ("MRSA") and methicillin-susceptible S. aureus ("MSSA"). Suvratoxumab and AR-301 are complementary products. Suvratoxumab's focus on preventive treatment of S. aureus pneumonia complements Aridis' AR-301 Phase 3 mAb program which is being developed as a therapeutic treatment of S. aureus pneumonia. A multinational, randomized, double blinded, placebo controlled Phase 2 study conducted by AstraZeneca (n=196 patients) showed that mechanically ventilated ICU patients colonized with S. aureus who are treated with suvratoxumab saw a relative risk reduction of pneumonia by 32% in the overall intend to treat study population, and by 47% in the prespecified under 65 year old population, which is the target population in the planned Phase 3 study. The relative risk reduction in the target population reached statistical significance, and was also associated with a substantial reduction in the duration of care needed in the ICU and hospital [see https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30995-6/fulltext]. We believe that AR-320 will be first-line treatment, first to market, first-in-class pre-emptive treatment of S. aureus colonized patients.

To date, we have devoted substantially all of our resources to research and development efforts relating to our therapeutic candidates, including conducting clinical trials and developing manufacturing capabilities, in-licensing related intellectual property, protecting our intellectual property and providing general and administrative support for these operations. We have generated revenue from our payments under our collaboration strategic research and development contracts and federal awards and grants, as well as awards and grants from not-for-profit entities and fee for service to third-party entities. Since our inception, we have funded our operations primarily through these sources and the issuance of common stock, convertible preferred stock, and debt securities. Current clinical development activities are focused on AR-301, AR712 and AR-501. Our expenses and resulting cash burn during the years ended December 31, 2021 and 2020, were largely due to costs associated with the Phase 3 study of AR-301 for the treatment of VAP caused by the S. aureus bacteria, preclinical development of AR-01 COVID-19 mAbs, the preparation of AR-320 for a phase 3 clinical trial that is expected to be initiated in the first half of 2022 and the Phase 1/2 study of AR-501 for the treatment of chronic lung infections associated with cystic fibrosis.

Financial Overview

We have incurred losses since our inception. Our net losses were approximately $42.2 million and $22.3 million for the years ended December 31, 2021 and 2020, respectively. As of December 31, 2021 we had approximately $20.0 million of cash, cash equivalents and restricted cash and had an accumulated deficit of approximately $165.3 million. Substantially, all of our net losses have resulted from costs incurred in connection with our research and development programs, clinical trials, intellectual property matters, strengthening our manufacturing capabilities, and from general and administrative costs associated with our operations.

We have not yet achieved commercialization of our products and have a cumulative net loss from our operations. We will continue to incur net losses for the foreseeable future. Our consolidated financial statements have been prepared assuming that we will continue as a going concern. We will require additional capital to meet our long-term operating requirements. We expect to raise additional capital through the sale of equity and/or debt securities. Historically, our principal sources of cash have included proceeds from grant funding, fees for services performed, issuances of debt and the sale of our preferred stock. Our principal uses of cash have included cash used in operations. We expect that the principal uses of cash in the future will be for continuing operations, funding of research and development including our clinical trials and general working capital requirements.

We anticipate that our expenses will increase substantially if and as we:

? continue enrollment in our ongoing clinical trials;

? initiate new clinical trials;




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? seek to identify, assess, acquire and develop other products, therapeutic

candidates and technologies;

? seek regulatory and marketing approvals in multiple jurisdictions for our

therapeutic candidates that successfully complete clinical studies;

? establish collaborations with third parties for the development and

commercialization of our products and therapeutic candidates;

? make milestone or other payments under our agreements, pursuant to which we

have licensed or acquired rights to intellectual property and technology;

? seek to maintain, protect, and expand our intellectual property portfolio;

? seek to attract and retain skilled personnel;

? incur the administrative costs associated with being a public company and

related costs of compliance;

? create additional infrastructure to support our operations as a commercial

stage public company and our planned future commercialization efforts;

? experience any delays or encounter issues with any of the above; and

? experience protracted COVID-19 related delays.

We expect to continue to incur significant expenses and losses for at least the next several years. Accordingly, we anticipate that we will need to raise additional capital in order to obtain regulatory approval for, and the commercialization of, our therapeutic candidates. Until such time that we can generate meaningful revenue from product sales, if ever, we expect to finance our operating activities through public or private equity or debt financings, government or other third-party funding and other collaborations, strategic alliances and licensing arrangements or a combination of these approaches. If we are unable to obtain funding on a timely basis, we may be required to significantly curtail, delay or discontinue one or more of our research or development programs or the commercialization of any approved therapies or products or be unable to expand our operations or otherwise capitalize on our business opportunities, as desired, which could adversely affect our business, financial condition and results of operations.

SIBV License Agreement

In July 2019, we entered into an option agreement with Serum International B.V. ("SIBV"), an affiliate of Serum Institute of India Private Limited, which granted SIBV the option to license multiple programs from us and access our MabIgX® platform technology for asset identification and selection. We received an upfront cash payment of $5 million upon execution of this option agreement. In connection with the option agreement, SIBV made an equity investment whereby we issued 801,820 shares of our restricted common stock in a private placement to SIBV for total gross proceeds of $10 million.

SAMR License Agreement

In September 2019, we entered into a License, Development and Commercialization Agreement (the "License Agreement") with Serum AMR Products ("SAMR"). Pursuant to the License Agreement, we received upfront payments totaling $15 million, of which $5 million was received in July 2019 through the option agreement referred to above, and may receive milestone payments and royalty-based payments from SAMR if certain milestones and sales levels as defined in the License Agreement are met.

Given the equity investment by SIBV was negotiated in conjunction with the option agreement, which resulted in the execution of the License Agreement, all arrangements were evaluated as a single agreement and amounts were allocated to the elements of the



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arrangement based on their fair value. We allocated the proceeds received from the sale of the restricted common stock and upfront payment from the License Agreement, net of issuance and contract costs, of approximately $22.5 million accordingly:

we recorded approximately $5.0 million, which represented the fair value of the

? restricted common stock issued of $5.4 million, net of $441,000 of issuance

costs, to stockholders' equity within our consolidated balance sheet;

we recorded approximately $19.6 million to deferred revenue based on the

? $15 million from upfront payments under the License Agreement and approximately

$4.6 million from the equity allocation; and

we capitalized approximately $2.1 million to contract costs, which consists of

? approximately $376,000 issuance costs from the equity allocation and

approximately $1.7 million in other direct costs to obtain the License


   Agreement.


CFF License Agreement

Under the Development Program Letter Agreement with CFF (the "CFF Agreement"), entered into in December 2016 and amended in November 2018 to support funding for the development of our Inhaled Gallium Citrate Anti-Infective program, we recognized revenue of approximately $0.5 million for the year ended December 31, 2021 and $1.0 million for the year ended December 31, 2020. We expect that any revenue we generate for the foreseeable future will fluctuate from period to period as a result of the timing of when performance obligations and variable consideration criteria under the contract are satisfied.

Kermode License Agreement

Under a product discovery agreement with Kermode Biotechnologies, Inc. ("Kermode"), entered into in February 2021 to fund the discovery of product candidates for African Swine Fever Virus ("ASFV") with an option to include the discovery of product candidates for swine influenza virus ("SIV"). For the year ended December 31, 2021, the Company recognized approximately $465,000 in revenue related to the Kermode Agreement. The Company has recorded the remaining portion of the nonrefundable upfront payment as a contract liability of approximately $285,000 to deferred revenue, current, as of December 31, 2021.

Gates Foundation License Agreement

On October 15, 2021, the Company entered into a Grant Agreement with the Bill and Melinda Gates Foundation ("Gates Foundation"). The goal of the Grant, is to develop durable approaches to block the infection and transmission of pathogens. For the year ended December 31, 2021, the Company recognized revenue of approximately $546,000 from the Grant. The Company recorded a contract liability for the remaining consideration of approximately $1,387,000 to deferred revenue, current, on its consolidated balance sheet as of December 31, 2021.

Critical Accounting Policies and Estimates

Our management's discussion and analysis of our financial condition and results of operations is based on our consolidated financial statements, which we have prepared in accordance with generally accepted accounting principles in the United States, or GAAP.

The preparation of our consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported expenses during the reported periods. We evaluate these estimates and judgments on an ongoing basis. Such estimates include those related to the evaluation of our ability to continue as a going concern, our best estimate of standalone selling price of revenue deliverables, useful live of long lived assets, classification of deferred revenue, income taxes, assumptions used in the Black Scholes Merton ("BSM") model to calculate the fair value of stock based compensation, deferred tax asset valuation allowances, and preclinical study and clinical trial accruals. We base our estimates on historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Our actual results may differ from these estimates under different assumptions or conditions.



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We define our critical accounting policies as those accounting principles generally accepted in the United States that require us to make subjective estimates and judgments about matters that are uncertain and are likely to have a material impact on our financial condition and results of operations as well as the specific manner in which we apply those principles. Our critical accounting policies are primarily for revenue recognition and accrued research and development costs. We believe the significant accounting policies used in the preparation of our consolidated financial statements are as follows:

Revenue Recognition

We recognize revenue based on Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers ("ASC 606"), which applies to all contracts with customers, except for contracts that are within the scope of other standards, such as leases, insurance, collaboration arrangements and financial instruments.

To determine revenue recognition for arrangements that we determine are within the scope of ASC 606, we perform the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue at a point in time, or over time, as the entity satisfies performance obligations. We only apply the five-step model to contracts when it is probable that we will collect the consideration it is entitled to in exchange for the goods or services we transfer to the customer. At contract inception, once the contract is determined to be within the scope of ASC 606, we assess the goods or services promised within each contract, determine those that are performance obligations, and assess whether each promised good or service is distinct. We then recognize as revenue the amount of the transaction price that is allocated to the respective performance obligation when (or as) the performance obligation is satisfied.

As part of the accounting for customer arrangements, we must use judgment to determine: a) the number of performance obligations based on the determination under step (ii) above; b) the transaction price under step (iii) above; and c) the standalone selling price for each performance obligation identified in the contract for the allocation of the transaction price in step (iv) above. We use judgment to determine whether milestones or other variable consideration should be included in the transaction price.

The transaction price is allocated to each performance obligation on a relative standalone selling price basis. In developing the standalone price for a performance obligation, we consider applicable market conditions and relevant entity-specific factors, including factors that were contemplated in negotiating the agreement with the customer and estimated costs. We recognize revenue as or when the performance obligations under the contract are satisfied. We receive payments from our customers based on payment schedules established in each contract. We record any amounts received prior to satisfying the revenue recognition criteria as deferred revenue on the consolidated balance sheet. Amounts recognized as revenue, but not yet received or invoiced are recorded within other receivables on the consolidated balance sheet. Amounts are recorded as other receivables on the consolidated balance sheet when our right to consideration is unconditional. We do not assess whether a contract has a significant financing component if the expectation at contract inception is such that the period between payment by the customer and the transfer of a majority of the promised goods or services to the customer will be one year or less.

Research and Development Expenses

We recognize research and development expenses to operations as they are incurred. Our research and development expenses consist primarily of:

? salaries and related overhead expenses, which include stock-based compensation

and benefits for personnel in research and development functions;

fees paid to consultants and contract research organizations, or CROs,

including in connection with our preclinical studies and clinical trials and

? other related clinical trial fees, such as for investigator grants, patient

screening, laboratory work, clinical trial material management and statistical

compilation and analyses;

? costs related to acquiring and manufacturing clinical trial materials;

? costs related to compliance with regulatory requirements; and




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? payments related to licensed products and technologies.

Costs for certain development activities are recognized based on an evaluation of the progress to completion of specific tasks using information and data provided to us by our vendors and clinical sites. Nonrefundable advance payments for goods or services to be received in future periods for use in research and development activities are deferred and capitalized. The capitalized amounts are then expensed as the related goods are delivered or when the services are performed.

We plan to increase our research and development expenses for the foreseeable future as we continue to develop our therapeutic programs, and subject to the availability of additional funding, further advance the development of our therapeutic candidates for additional indications and begin to conduct clinical trials.

The process of conducting the necessary clinical research to obtain regulatory approval is costly and time-consuming, and the successful development of our therapeutic candidates is highly uncertain. As a result, we are unable to determine the duration and completion costs of our research and development projects or when and to what extent we will generate revenue from the commercialization and sale of any of our therapeutic candidates.

Stock-Based Compensation

We recognize compensation expense for all stock-based awards based on the grant-date estimated fair values, which we determine using the BSM option pricing model, on a straight-line basis over the requisite service period for the award. We account for forfeitures as they occur.

The BSM option pricing model incorporates various highly sensitive assumptions, including the fair value of our common stock, expected volatility, expected term and risk-free interest rates. The weighted average expected life of options was calculated using the simplified method as prescribed by the SEC's Staff Accounting Bulletin, Topic 14 ("SAB Topic 14"). This decision was based on the lack of relevant historical data due to our limited historical experience. In addition, due to our limited historical data, the estimated volatility also reflects the application of SAB Topic 14, incorporating the historical volatility of comparable companies whose stock prices are publicly available. The risk-free interest rate for the periods within the expected term of the option is based on the U.S. Treasury yield in effect at the time of grant. The dividend yield was zero, as we have never declared or paid dividends and have no plans to do so in the foreseeable future.

Income Taxes

We account for income taxes under the liability method. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized. For the years ended December 31, 2021 and 2020, no income tax expense or benefit was recognized, primarily due to a full valuation allowance recorded against the net deferred tax asset.

We assess all material positions taken in any income tax return, including all significant uncertain positions, in all tax years that are still subject to assessment or challenge by the relevant taxing authorities. Assessing an uncertain tax position begins with the initial determination of the position's sustainability and is measured at the largest amount of benefit that is greater than fifty percent likely of being realized upon ultimate settlement. At each balance sheet date, unresolved uncertain tax positions must be reassessed, and we determine whether (i) the factors underlying the sustainability assertion have changed and (ii) the amount of the recognized benefit is still appropriate. The recognition and measurement of tax benefits requires significant judgment. Judgments concerning the recognition and measurement of a tax benefit might change as new information becomes available.

Going Concern

We assess and determine our ability to continue as a going concern under the provisions of ASC 205-40, Presentation of Financial Statements-Going Concern, which requires us to evaluate whether there are conditions or events that raise substantial doubt about our ability to continue as a going concern within one year after the date that our annual and interim consolidated financial statements are issued. Certain additional financial statement disclosures are required if such conditions or events are identified. If and when an entity's liquidation becomes imminent, financial statements should be prepared under the liquidation basis of accounting.



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Determining the extent, if any, to which conditions or events raise substantial doubt about our ability to continue as a going concern, or the extent to which mitigating plans sufficiently alleviate any such substantial doubt, as well as whether or not liquidation is imminent, requires significant judgment by us. We have determined that there is substantial doubt about our ability to continue as a going concern for at least the one-year period following our consolidated financial statements issuance date, which have been prepared assuming that we will continue as a going concern. We have not made any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classification of liabilities that may result from the possible inability of us to continue as a going concern.

Results of Operations

Comparison of the Years Ended December 31, 2021 and 2020

The following table summarizes our results of operations for the years ended December 31, 2021 and 2020 (in thousands):



                                                                     Year Ended
                                                                    December 31,
                                                                 2021          2020         Change
Revenue:
Grant revenue                                                 $    1,535    $    1,000    $      535
Operating expenses:
Research and development                                          36,936        16,956        19,980
General and administrative                                         7,310         6,445           865
Total operating expenses                                          44,246        23,401        20,845
Loss from operations                                            (42,711)      (22,401)      (20,310)
Other (expense) income:
Interest (expense) income, net                                     (245)            77         (322)
Other income                                                          74             -            74
Gain on extinguishment of Paycheck Protection Program loan           722             -           722
Change in fair value of note payable                                (33)             -          (33)
Share of loss from equity method investment                            -           (9)             9
Net loss                                                      $ (42,193)    $ (22,333)    $ (19,860)

Grant Revenue. Grant revenue increased by approximately $0.5 million for the year ended December 31, 2021 primarily related to the recognition of revenue from the CFF, Gates Foundation and Kermode during 2021 and revenue from CFF in 2020.

Research and Development Expenses. Research and development expenses increased by approximately $20.0 million to $36.9 million for year ended December 31, 2021 from $17.0 million for the year ended December 31, 2020 due primarily to:

? an increase of approximately $11.5 million to in-license AR-320 rights from

Medimmune;

? an increase of approximately $5.6 million for AR-320 drug manufacture and

clinical trial oversight costs;

? an increase of approximately $0.7 million for SARS-CoV2 antibody exclusive

license;

? an increase of approximately $0.5 million for CFF project; and

? an increase of approximately $0.6 million in personnel, consulting and other

related costs;

General and Administrative Expenses. General and administrative expenses increased by approximately $0.9 million to $7.3 million for the year ended December 31, 2021 from $6.4 million for the year ended December 31, 2020 due primarily to increases in professional service fees, franchise tax and recruitment expense to attract talent.

Interest Expense, Net. Interest expense, net for the year ended December 31, 2021 consists primarily of the original issue discount on the Note Purchase Agreement with Streeterville Capital, LLC,. Interest income, net consists primarily of interest earned on our cash balances for the year ended December 31, 2020.

Gain on extinguishment of Paycheck Protection Program loan. This relates to the forgiveness of this loan during the year ended December 31, 2021.



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Change in fair value of note payable. This relates primarily to the change in fair value of the note payable pursuant to the Note Purchase Agreement with Streeterville Capital, LLC for the year ended December 31, 2021.

Share of Loss in Equity Method Investment. Loss from equity method investment decreased by approximately $9,000 to zero for the year ended December 31, 2021 from $9,000 for the year ended December 31, 2020 as our share of loss from our minority interest calculated under the equity method was limited to the reduction of the net book value of the investment to zero as of March 31,2020.

Other Income. Other income increased by approximately $74,000 from zero for the year ended December 31,2020. The increase was primarily related to income from a sublease agreement we entered into with a tenant on March 1, 2021 to sublet a small portion of our Los Gatos facility.

Liquidity, Capital Resources and Going Concern

As of December 31, 2021 we had approximately $20.0 million of cash, cash equivalents and restricted cash and had an accumulated deficit of approximately $165.3 million.

In May 2020, we received a loan in the form of a note, from Silicon Valley Bank ("SVB") in the aggregate amount of approximately $715,000 (the "Loan"), pursuant to the Paycheck Protection Program (the "PPP"). The PPP, established as part of the Coronavirus Aid, Relief and Economic Security Act ("CARES Act"), provided for loans to qualifying businesses for amounts up to 2.5 times of the average monthly payroll expenses of the qualifying business. In May 2021 we received notification that the PPP Loan was ultimately forgiven and we were legally released from being the Loan's primary obligor. The extinguishment of the liability was recognized in our consolidated statement of operations as an extinguishment of debt gain.

In October 2020, we entered into a Securities Purchase Agreement (the "October 2020 Purchase Agreement") with certain institutional investors (the "Purchasers"), pursuant to which we agreed to offer, issue and sell to the Purchasers, (i) in a registered direct offering, an aggregate of 1,134,470 shares (the "Shares") of common stock, par value $0.0001 per share ("Common Stock") and (ii) in a concurrent private placement, Series A warrants (the "Series A Warrants") and Series B warrants (the "Series B Warrants" and collectively, with the Series A Warrants, the "Warrants") to purchase up to an aggregate 567,234 shares (the "Warrant Shares") of Common Stock, for aggregate gross proceeds to us of approximately $8.5 million, before deducting estimated offering expenses payable by us. We agreed to pay Arcadia Securities, LLC a fee equal to 3.5% of the aggregate purchase price of the shares of its common stock sold in the offering to certain of the investors. In addition, we agreed to pay Cantor Fitzgerald & Co. a fee equal to 3.5% of the aggregate purchase price of the shares of its common stock sold in the offering.

In March 2021, we entered into a Securities Purchase Agreement with certain institutional and individual investors, pursuant to which we agreed to offer, issue and sell to these investors, in a registered direct offering, an aggregate of 1,037,405 shares of our common stock for aggregate gross proceeds to us of approximately $7.0 million, and after deducting commissions and offering costs, net proceeds were approximately $6.4 million.

As a result of the March 2021 registered direct offering price per share being less than the October 2020 registered direct offering price per share, we were obligated to issue an additional 124,789 shares of unregistered common stock to the investors in our October 2020 registered direct offering pursuant to the anti-dilutive provisions of the October 2020 Securities Purchase Agreement. In March 2021, we issued 124,789 shares to our common stockholders, who purchased in October 2020, with a fair value of approximately $986,000 which we recorded as a credit to additional paid-in capital, and since we have an accumulated deficit, the corresponding debit to additional paid-in capital, resulting in no dollar impact within our consolidated statement of changes in stockholders' equity (deficit).

On August 2, 2021, we entered into a Securities Purchase Agreement with an institutional investor, pursuant to which we agreed to offer, issue and sell to this investor, in a registered direct offering, 1,300,000 shares of our common stock, pre-funded warrants to purchase up to an aggregate of 3,647,556 shares of our common stock (the "Pre-Funded Warrants"), and warrants to purchase up to 2,473,778 shares of our common stock (the "Warrants"). The combined purchase price of each share of common stock and accompanying Warrants is $5.053 per share. The combined purchase price of each Pre-Funded Warrant and accompanying Warrant is $5.052 (equal to the combined purchase price per share of common stock and accompanying Warrant, minus $0.001). We received gross proceeds of approximately $25.0 million, and after deducting the placement agent fees and expenses and our estimated offering expenses, net proceeds were approximately $22.6 million.



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As a result of the August 2021 registered direct offering price per share being less than the October 2020 and March 2021 registered direct offerings price per share, we were obligated to issue an additional 634,600 shares of unregistered common stock to the investors in our October 2020 and March 2021 registered direct offerings pursuant to the anti-dilutive provisions of the October 2020 and March 2021 Securities Purchase Agreements. In August 2021, we issued 634,600 shares to our common stockholders, who purchased in October 2020 and March 2021, with a fair value of approximately $3.1 million which we recorded as a credit to additional paid-in capital, and since we have an accumulated deficit, the corresponding debit to additional paid-in capital, resulting in no dollar impact within our consolidated statement of changes in stockholders' equity (deficit).

The Company entered into a Note Purchase Agreement with Streeterville Capital, LLC (the "Lender"), pursuant to which we issued to the Lender a secured promissory note (the "Note") in the aggregate principal amount of $5,250,000. Closing occurred on November 23, 2021 (the "Issuance Date"). The Note carries an original issue discount of $250,000. The Note bears interest at the rate of 6% per annum and matures on November 23, 2023. Net proceeds after deducting the discount fee were $5,000,000.

The Company obtained financing for certain Director & Officer liability insurance policy premiums from First Insurance Funding. The total premiums, taxes and fees financed is approximately $1,645,000 with an annual percentage interest rate of 3.67%. At December 31, 2021 the Company recognized approximately $696,000 as insurance financing note payable in its consolidated balance sheet.

We have had recurring losses from operations since inception and negative cash flows from operating activities during the years ended December 31, 2021 and 2020. We anticipate that we will continue to generate operating losses and use cash in operations through the foreseeable future. Management plans to finance operations through equity or debt financings or other capital sources, including potential collaborations or other strategic transactions. There can be no assurances that, in the event that we require additional financing, such financing will be available on terms which are favorable to us, or at all. If we are unable to raise additional funding to meet our working capital needs in the future, we will be forced to delay or reduce the scope of our research programs and/or limit or cease our operations. We believe that our current available cash and cash equivalents, along with the additional cash received in February 2022 from additional debt funding, will not be sufficient to fund our planned expenditures and meet our obligations for at least the one-year period following our consolidated financial statements issuance date. There is substantial doubt about our ability to continue as a going concern unless we are able to successfully raise additional capital.

Cash Flows

Our net cash flow from operating, investing and financing activities for the periods below were as follows (in thousands):



                                                            December 31,
                                                          2021        2020
Net cash provided by (used in):
Operating activities                                   $ (22,936)  $ (20,476)
Investing activities                                        (530)       (367)
Financing activities                                       34,720       8,678

Net increase (decrease) in cash and cash equivalents $ 11,254 $ (12,165)

Cash Flows from Operating Activities.

Net cash used in operating activities was approximately $22.9 million for the year ended December 31, 2021, which was primarily due to our net loss of approximately $42.2 million, offset by an increase of approximately $5.3 million in accrued liabilities and other, an increase of approximately $2.6 million in accounts payables, an increase of approximately $2.3 million in deferred revenue and other receivables, an increase of approximately $6.4 million related to issuance of common stock for licensing activities, and non-cash charges of approximately $2.3 million related to stock-based compensation and approximately $435,000 in depreciation and amortization.

Net cash used in operating activities was approximately $20.5 million for the year ended December 31, 2020, which was primarily due to our net loss of approximately $22.3 million, an increase of approximately $488,000 related to capitalized contract costs, resulting from the SAMR License Agreement entered into in 2019, a decrease of approximately $756,000 in accrued liabilities and other, a decrease of approximately $83,000 in accounts payables, and an increase of approximately $144,000 in other receivables. The



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cash used in operating activities was partially offset by a decrease of approximately $808,000 in prepaid expenses and a decrease of approximately $46,000 in other assets, and the non-cash charges of approximately $2.1 million related to stock-based compensation and approximately $337,000 in depreciation and amortization.

Cash Flows from Investing Activities.

Cash used in investing activities of approximately $530,000 during the year ended December 31, 2021, was due to improvements to our new leased facility and the purchase of lab equipment.

Cash used in investing activities of approximately $367,000 during the year ended December 31, 2020, was due to the purchase of equipment, primarily for diagnostic use in clinical trials, and improvements to our new leased facility in December 2020.

Cash Flows from Financing Activities.

Net cash provided by financing activities of approximately $34.7 million during the year ended December 31, 2021 was due to net proceeds received from issuance of common stock and common stock warrants of approximately $29.7 million, and proceeds received from notes payable of approximately $5.0 million.

Net cash provided by financing activities of approximately $8.7 million during the year ended December 31, 2020 was due to net proceeds received from a registered direct offering of our common stock and a concurrent private placement of common stock warrants of approximately $7.9 million, proceeds received from the PPP Loan of approximately $715,000, net proceeds received from our ATM Agreement of approximately $62,000, and net proceeds received from stock option exercises of approximately $14,000.

Future Funding Requirements

To date, we have generated revenue from grants and contract services performed and funding from the issuance of convertible preferred stock and common stock sales. We do not know when, or if, we will generate any revenue from our development stage therapeutic programs. We do not expect to generate any revenue from sales of our therapeutic candidates unless and until we obtain regulatory approval. At the same time, we expect our expenses to increase in connection with our ongoing development activities, particularly as we continue the research, development and clinical trials of, and seek regulatory approval for, our therapeutic candidates. We expect to incur additional costs associated with operating as a public Company. In addition, subject to obtaining regulatory approval of any of our therapeutic candidates, we expect to incur significant commercialization expenses for product sales, marketing, manufacturing and distribution. We anticipate that we will need additional funding in connection with our continuing operations.

Our future funding requirements will depend on many factors, including:

? the progress, costs, results and timing of our clinical trials;

? FDA acceptance, if any, of our therapies for infectious diseases and for other

potential indications;

? the outcome, costs and timing of seeking and obtaining FDA and any other

regulatory approvals;

? the number and characteristics of product candidates that we pursue, including

our product candidates in preclinical development;

? the ability of our product candidates to progress through clinical development

successfully;

? our need to expand our research and development activities;

? the costs of acquiring, licensing or investing in businesses, products, product

candidates and technologies;




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our ability to maintain, expand and defend the scope of our intellectual

property portfolio, including the amount and timing of any payments we may be

? required to make, or that we may receive, in connection with the licensing,

filing, prosecution, defense and enforcement of any patents or other

intellectual property rights;

? the effect of the COVID-19 pandemic on our business and operations;

? our need and ability to hire additional management and scientific, medical and

administrative personnel;

? the effect of competing technological and market developments; and

? our need to implement additional internal systems and infrastructure, including

financial and reporting systems.

Until such time that we can generate meaningful revenue from the sales of approved therapies and products, if ever, we expect to finance our operating activities through public or private equity or debt financings, government or other third-party funding, and other collaborations, strategic alliances and licensing arrangements or a combination of these approaches. To the extent that we raise additional capital through the sale of equity or convertible debt securities, the ownership interests of our common stockholders will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of our common stockholders. Debt financing, if available, may involve agreements that include conversion discounts or covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends. If we raise additional funds through government or other third-party funding, marketing and distribution arrangements or other collaborations, or strategic alliances or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates or to grant licenses on terms that may not be favorable to us.

Off-Balance Sheet Arrangements

During the periods presented we did not have, nor do we currently have, any off-balance sheet arrangements as defined under the rules of the SEC.

JOBS Act Accounting Election

The JOBS Act permits an "emerging growth Company" such as us to take advantage of an extended transition period to comply with new or revised accounting standards applicable to public companies. We are choosing to take advantage of this provision and, as a result, we will adopt the extended transition period available under the JOBS Act until the earlier of the date we (i) are no longer an emerging growth Company or (ii) affirmatively and irrevocably opt out of the extended transition period provided under the JOBS Act.

Recent Accounting Pronouncements

Information regarding recent accounting pronouncements applicable to us is included in the notes to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K.

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