BEIJING-- July 20, 2022 -- Sinovac Biotech Ltd. (“SINOVAC” or the “Company”) (NASDAQ: SVA), a leading provider of biopharmaceutical products in China, announced that a phase III clinical trial for SINOVAC’s inactivated quadrivalent influenza vaccine was initiated in the Republic of Chile through a collaboration with the Pontificia Universidad Católica de Chile (PI Dr. Pablo González). Study results will provide scientific evidence to support SINOVAC’s influenza vaccine immunogenicity and protection capacity.

This clinical trial aims to evaluate the immunogenicity and safety of the quadrivalent influenza vaccine among individuals aged 3 and above. In total, there will be 1,600 volunteers recruited, half of whom will receive 1 dose of SINOVAC’s inactivated quadrivalent influenza vaccine, and the other half will receive a different quadrivalent influenza vaccine commercially available in Chile. Children aged between 3 and 8 of both groups who haven’t received any influenza vaccine will receive 2 doses of influenza vaccine. All of the participants will be observed for 28 days following the completed inoculation to evaluate vaccine safety. The upcoming clinical trial in Chile will provide further evidence on the efficacy and safety of SINOVAC’s quadrivalent influenza vaccine.