Sinovac Biotech Ltd is a China-based biopharmaceutical company that focuses on research, development, manufacturing and commercialization of vaccines that protect against human infectious diseases including, without limitation, hepatitis A, hepatitis B, hand foot and mouth disease (HFMD) caused by EV71, seasonal influenza, H5N1 and H1N1 pandemic influenza, coronavirus, pneumococcus, poliomyelitis, varicella and mumps.