[Sinovac Reports Unaudited First Quarter 2010 Financial Results - Conference call scheduled for Thursday, May 13, 2010 at 8:00 PM EDT – — Sinovac Biotech Ltd. ( Beijing — May 13, 2010 NASDAQ: SVA), a leading China-based vaccine manufacturer , announc ed today its un audited financial results for the three-month period ended March 31, 2010. First Quarter 2010 Financial] [1 -32371 SINOVAC BIOTECH LTD. No. 39 Shangdi Xi Road Haidian District Beijing 100085, People’s Republic of China Form 20-F x Form 40-F o o o SINOVAC BIOTECH LTD.]