[REVISED: SINOVAC PROVIDES UPDATE ON CLINICAL TRIAL FOR H1N1 VACCINE TRIALS -H1N1 Vaccine Shows Good Safety Profile- BEIJING, Aug. 4 /PRNewswire-Asia/ -- 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 received their first shot of the vaccine] [FORM 6-K __________ __________ SINOVAC BIOTECH LTD. 39 Shangdi Xi Road Haidian District Beijing 100085, People’s Republic of China X Form 20-F X Yes _______ No N/A 82- SINOVAC BIOTECH LTD. Form 6-K TABLE OF CONTENTS Page 3 4]

[SINOVAC PROVIDES UPDATE ON CLINICAL TRIAL FOR H1N1 VACCINE TRIALS -H1N1 Vaccine Shows Good Safety Profile- BEIJING, Aug. 3 /PRNewswire-Asia/ -- 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] [FORM 6-K __________ __________ SINOVAC BIOTECH LTD. 39 Shangdi Xi Road Haidian District Beijing 100085, People’s Republic of China X Form 20-F X Yes _______ No N/A 82- SINOVAC BIOTECH LTD. Form 6-K TABLE OF CONTENTS Page 3 4]

[Sinovac Initiates Dosing in Human Clinical Trial of Panflu for Pandemic Influenza A (H1N1) BEIJING, July 22 /PRNewswire-Asia/ -- Sinovac Biotech Ltd. (NYSE AMEX: SVA), a leading provider of vaccines in China, today announced that it has initiated dosing today in its clinical trial of various Panflu vaccine candidates for pandemic influenza A (H1N1). Results are expected in September 2009.] [FORM 6-K __________ __________ SINOVAC BIOTECH LTD. 39 Shangdi Xi Road Haidian District Beijing 100085, People’s Republic of China X Form 20-F X Yes _______ No N/A 82- SINOVAC BIOTECH LTD. Form 6-K TABLE OF CONTENTS Page 3 4]

[Sinovac Adjourns 2008 Annual General Meeting BEIJING, July 16 /PRNewswire-Asia/ -- Sinovac Biotech Ltd. (NYSE Amex: SVA), a leading developer and provider of vaccines in China, announced today that its Annual General Meeting originally scheduled for July 16, 2009 has been adjourned to July 30, 2009. At the July 16, 2009 Annual General Meeting, the required quorum of a majority] [FORM 6-K __________ __________ SINOVAC BIOTECH LTD. 39 Shangdi Xi Road Haidian District Beijing 100085, People’s Republic of China X Form 20-F X Yes _______ No N/A 82- SINOVAC BIOTECH LTD. Form 6-K TABLE OF CONTENTS Page 3 4]