Sinovac Biotech Ltd. (NYSE AMEX: SVA), a leading provider of vaccines in China, announced today that the clinical trial of its A/H1N1 influenza vaccine is proceeding well. All of the volunteers have received their first shot of the vaccine and, during the three-day observation of safety, the preliminary tests on the A/H1N1 influenza vaccine have indicated that the vaccine is safe and reliable in humans.