 BEIJING--BUSINESS WIRE--SINOVAC Biotech Ltd. NASDAQ: SVA Sinovac or the Company, a leading provider of biopharmaceutical products in China, announced today that it had signed an advance purchase agreement APA with Gavi, the Vaccine Alliance Gavi, which is on behalf of COVAX Facility, to provide up to 380 million doses of inactivated COVID-19 vaccine, CoronaVacfor distribution through the COVAX Facility. According to the APA, SINOVAC will supply 50 million doses of CoronaVac by t 