Sinovac to Host Conference Call to Report First Quarter 2008 Financial Results

Beijing, May 15 /Xinhua-PRNewswire/ -- Sinovac Biotech Ltd. (Amex: SVA), a leading provider of vaccines in China, today announced that it will host a conference call on Friday, May 16, 2008 at 9:00 a.m. ET to review the Company’s first quarter financial results for the period ended March 31, 2008 and provide an update on recent corporate developments.

To access the conference call, please dial 1-877-407-4018 (USA) or

1-201-689-8471 (international). A replay of the call will be available from 11:00 a.m. ET on May 16, until May 30, 2008 at midnight. To access the replay, please dial 1-877-660-6853 (USA) or 1-201-612-7415 (international) and reference the account number 3055 and the access code 285507.

A live audio webcast of the call will also be available from the Investors section on the corporate web site at http://www.sinovac.com . A webcast replay can be accessed on the corporate website beginning May 16, 2008 and the replay will remain available for 30 days.

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 commercialized vaccines include Healive(R) (hepatitis A), Bilive(R) (combined hepatitis A and B), Anflu(R) (influenza) and Panflu(TM) (H5N1). Sinovac is currently developing Universal Pandemic Influenza vaccine and Japanese encephalitis vaccine. Additional information about Sinovac is available on its website, http://www.sinovac.com . To be added to our distribution list, please email: info@sinovac.com.

For more information, please contact:

Helen G. Yang

Sinovac Biotech Ltd.

Tel: +86-10-8289-0088 x871

Fax: +86-10-6296-6910

Email: info@sinovac.com

Investors/Media:

Stephanie Carrington/Janine McCargo

The Ruth Group

Tel: +1-646-536-7017/7033

Email: scarrington@theruthgroup.com

jmccargo@theruthgroup.com

SOURCE Sinovac Biotech Ltd.