[Law Debenture Corporate Services Inc. 400 Madison Avenue, 4th Floor New York, New York 10017 212-750-6474 (Name, address and telephone number of agent for service) Copies to: David T. Zhang, Esq. Eugene Y. Lee, Esq. Latham & Watkins 41 st Floor, One Exchange Square 8 Connaught Place, Central] [[Letterhead of Rhudd & Associates] January 27, 2010 Sinovac Biotech Ltd. No.39 Shangdi Xi Road, Haidian District, Beijing 100085 People’s Republic of China Dear Sirs, Sinovac Biotech Ltd. (the “Company”) For the purposes of giving this opinion, we have examined and relied upon copies of the following documents: (i) the 462(b) Registration Statement; and (ii) the Shelf Registration Statement. We] [CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM in the Registration Statement (Form F-3) filed with on January 27, 2010 and related Prospectus of for the registration of 1,500,000 common shares and to the incorporation by reference therein of We consent to the reference to our firm under the caption “Experts” Vancouver, Canada January 27, 2010 Chartered Accountants]