6-K

FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

REPORT OF FOREIGN ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 OF THE

SECURITIES EXCHANGE ACT OF 1934

For the month of June, 2009

__________

Commission File Number: 001-32371

__________

SINOVAC BIOTECH LTD.

39 Shangdi Xi Road

Haidian District

Beijing 100085, People’s Republic of China

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F X              Form 40-F  _______

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):________________

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):________________

Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes  _______              No X      

If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b):

82- N/A      

SINOVAC BIOTECH LTD.

Form 6-K

TABLE OF CONTENTS

	Page
Signature	3
Exhibit 99.1 – Press Release	4

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	SINOVAC BIOTECH LTD.
	By:	/s/ Weidong Yin
		Name:   Weidong Yin
		Title:      Chief Executive Officer, President
Date:  June 18, 2009

EX-99.1

Exhibit 99.1

Sinovac Receives China's First Influenza A (H1N1) Vaccine Order

BEIJING, June 19 /PRNewswire-Asia/ -- Sinovac Biotech Ltd. (NYSE Amex: SVA), a leading developer and provider of vaccines in China, announced today that the Company received the first order in China to supply its influenza A (H1N1) vaccine to the Beijing government. The initial order consists of 4 million doses and is expected to be delivered by the end of September. This order will be administered to 2 million people in the high risk group. Additional orders are expected beginning in October and, in total, Sinovac expects to supply approximately 10 million doses to the Beijing government. The 10 million doses will be administered to 5 million people in Beijing.

On June 14, 2009, Sinovac completed construction of the H1N1 virus seed bank necessary to produce a virus antigen and commenced production of the first batch of H1N1 vaccine. Sinovac expects to complete production of the first batch by the end of July.

Mr. Weidong Yin, Chairman, President and CEO of Sinovac, commented, "We are organizing and coordinating all personnel and resources to produce the H1N1 vaccine, as we have almost completed the production of our seasonal influenza vaccine. With the support and instruction of the relevant government and health authorities, Sinovac will fully utilize its proven development and production abilities from both the H5N1 vaccine and seasonal flu vaccine to ensure the efficient production of the H1N1 vaccine. We are working closely with authorities in order to contribute to the prevention and control of the H1N1 epidemic situation."

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® (hepatitis A), Bilive® (combined hepatitis A and B), and Anflu® (influenza). Panflu(TM), Sinovac's pandemic influenza vaccine (H5N1), has already been approved for government stockpiling. Sinovac is developing vaccines for enterovirus 71, universal pandemic influenza, Japanese encephalitis vaccine, and human rabies vaccine. Its wholly owned subsidiary, Tangshan Yian, is conducting field trials for independently developed inactivated animal rabies vaccines.

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: info@sinovac.com

    Investors:

     Amy Glynn/Sara Pellegrino

     The Ruth Group

     Tel:   +1-646-536-7023/7002

     Email: aglynn@theruthgroup.com

                spellegrino@theruthgroup.com

    Media:

     Janine McCargo

     The Ruth Group

     Tel:   +1-656-536-7033