[] [[Letterhead of Rhudd & Associates] September 10, 2009 Sinovac Biotech Ltd. No.39 Shangdi Xi Road, Haidian District, Beijing 100085 People’s Republic of China Dear Sirs, Sinovac Biotech Ltd. (the “Company”) As Antigua and Barbuda legal counsel to the Company, we have examined (i) the Registration Statement, (ii) the Plan, (iii) the articles of incorporation and by-laws of the Company, and] [CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM Vancouver, Canada, September 10, 2009 Chartered Accountants EX-23.1 3 dex231.htm CONSENT OF ERNST & YOUNG LLP, INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM]