Sinovac Biotech Ltd. (SINOVAC) is a biopharmaceutical company based in China that specializes in the research and development, production, and marketing of vaccines designed to safeguard against various human infectious diseases. The range of SINOVAC's products encompasses vaccines for COVID-19, Hand-Foot-Mouth disease caused by enterovirus 71 (EV71), hepatitis A, varicella, influenza, poliomyelitis, pneumococcal disease, and mumps.