SoftOx Solutions AS (SoftOx) have announced that the first subject has received SoftOx Inhaled Solution (SIS), in the first-in-human Phase 1 trial. SIS is an aerosolized pan-antimicrobial product intended for the treatment of upper and lower respiratory tract viral and bacterial infections. The trial is part of a development program for the use of SIS in the treatment of SARS-CoV-2 (COVID-19) and other respiratory tract infections, and is a collaboration between SoftOx and University of Copenhagen. The first subject received a single administration of low dose SIS. Healthy volunteers will receive three escalating doses of SIS or placebo, nebulised as a single dose once, twice or four times daily for 5 days. SIS is a stabilised solution of hypochlorous acid that can be aerosolised and inhaled. The antimicrobial properties of hypochlorous acid are well described, and endogenous production of hypochlorous acid is one of the key elements involved in host immunity from infectious disease. SIS-01 (EudraCT No.: 2020-004462-19) is a single-centre, randomised, double-blind, placebo-controlled, study will explore the safety and tolerability of single and multiples doses of inhaled nebulised SIS in healthy subjects.