BEIJING, Dec. 1 /PRNewswire-Asia/ -- Sinovac Biotech Ltd. (NYSE:SVA), a leading provider of biopharmaceutical products in China, announced today that it has received its fourth purchase order for its H1N1 vaccine, PANFLU.1(TM), from China's Ministry of Industry and Information Technology for the national purchase plan. Under this purchase order, Sinovac is required to produce an additional one million doses of PANFLU.1 (TM) (15ug/0.5ml) for the Chinese central government. The delivery of this order is expected to be completed early next year. The Company recently completed the expansion of its production line utilized to manufacture the seasonal influenza, H1N1 and H5N1 vaccines, thereby increasing its annual production capacity by approximately 30%. Sinovac is utilizing its expanded production line to manufacture the one million doses to fulfill this purchase order. In aggregate, Sinovac has received orders of PANFLU.1 from the Chinese government for a total 12.49 million doses, and 7.56 million doses of PANFLU.1 have been delivered for the Chinese vaccination campaign. Mr. Weidong Yin, Chairman, President and CEO of Sinovac, commented, "We are very proud to be supplying our H1N1 vaccine to the Chinese government and are confident that we can complete the national H1N1 vaccine stockpiling task in a timely manner. With the production capacity expansion, Sinovac will be better positioned to work towards our goal of providing citizens of China with affordable, international-quality vaccines." About Sinovac Sinovac Biotech Ltd. is a China-based biopharmaceutical company that focuses on the research, development, manufacture and commercialization of vaccines that protect against human infectious diseases. Sinovac's vaccine products include Healive(R) (hepatitis A), Bilive(R) (combined hepatitis A and B), and Anflu(R) (influenza). Panflu(R) and PANFLU.1(TM), Sinovac's pandemic influenza vaccine (H5N1) and H1N1 vaccine, have already been approved for government stockpiling. Sinovac is developing vaccines for enterovirus 71, universal pandemic influenza, Japanese encephalitis, and human rabies. Its wholly owned subsidiary, Tangshan Yian, is conducting field trials for independently developed inactivated animal Safe Harbor Statement This announcement contains forward-looking statements. These statements are made under the "safe harbor" provisions of the U.S. Private Securities Litigation Reform Act of 1995. These forward-looking statements can be identified by words or phrases such as "will," "expects," "anticipates," "future," "intends," "plans," "believes," "estimates" and similar statements. Among other things, the business outlook and quotations from management in this press release contain forward-looking statements. Statements that are not historical facts, including statements about Sinovac's beliefs and expectations, are forward-looking statements. Forward-looking statements involve inherent risks and uncertainties. A number of important factors could cause actual results to differ materially from those contained in any forward- looking statement. Sinovac does not undertake any obligation to update any forward-looking statement, except as required under applicable law. For more information, please contact: Helen G. Yang Sinovac Biotech Ltd. Tel: +86-10-8289-0088 x9871 Fax: +86-10-6296-6910 Email: Investors: Amy Glynn/Stephanie Carrington The Ruth Group Tel: +1-646-536-7023/7017 Email: Media: Janine McCargo The Ruth Group Tel: +1-646-536-7033 Email: DATASOURCE: Sinovac Biotech Ltd. CONTACT: Helen G. Yang of Sinovac Biotech Ltd., +86-10-8289-0088 x9871, +86-10-6296-6910 (fax), ; or Investors, Amy Glynn, +1-646-536-7023, , or Stephanie Carrington, +1-646-536-7017, , or Media, Janine McCargo, +1-646-536-7033, , all of The Ruth Group, for Sinovac Biotech Ltd.

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