Sinovac Biotech (SVA) sees a morning spike and call volume is 4X the expected for the first hour of trading on reports Beijing will extend an H1N1 flu vaccine innoculation to all the city’s 16 million residents. Shares have rallied back from morning lows around $7.95 and are unchanged at $8.18 on the session. 1,150 calls and 125 puts traded. Nov 7.5 and 10 calls are the most actives.