* SSEC 0.3%, CSI300 0.5%

* Healthcare firms rise on strong earnings

* Tech shares gain on Beijing's concession for auditing issues

SHANGHAI, March 23 (Reuters) - Chinese shares closed up on Wednesday, as investors were expecting measures to stabilise the economy after a surge in domestic COVID-19 infections.

** At the close, the Shanghai Composite index was up 0.3% at 3,271.03, rising for the sixth consecutive session. The blue-chip CSI300 index gained 0.5%.

** Investors have been expecting more easing moves, including possible cuts to banks' reserve requirements, after assurances of more support by the country's economic czar Vice Premier Liu He and other policymaking bodies last week.

** Leading gains, the real estate sector sub-index rose 1.9%, while the healthcare sub-index jumped 2.48% after companies reported strong earnings. ** China has been urging its people to take vaccines and carrying out mass testing to contain an outbreak of Omicron cases in its wealthiest city Shanghai, which reported a sixth straight increase in daily asymptomatic coronavirus cases.

** Shares of hydrogen-related firms such as Hunan Hengguang Technology Co rose to their daily limit as the state planner unveiled production plans of hydrogen and hydrogen-fuelled vehicles by 2025.

** Tech firms listed in Hong Kong gained more than 3.23% in the morning trading as investors applauded Beijing's possible concession for audit issues and the end of a criminal case against ZTE in the United States.

** Chinese regulators have asked some of the country's U.S.-listed firms, including Alibaba, Baidu and JD.com, to prepare for more audit disclosures, sources said, as Beijing steps up efforts to ensure domestic companies remain listed in New York.

** Hong Kong shares of ZTE Corp soared as much as 60% as trading resumed in the afternoon, while its Shenzhen shares rose nearly 10%. The telecommunications equipment maker completed five years of probation in the U.S.

** Around the region, MSCI's Asia ex-Japan stock index was firmer by 0.76%, while Japan's Nikkei index closed up 3%. ** At 07:11 GMT, the yuan was quoted at 6.3762 per U.S. dollar, 0.16% weaker than the previous close.

(Reporting by Shanghai Newsroom; editing by Uttaresh.V and Amy Caren Daniel)