Sinovac Biotech (SVA) sees a midday spike on volume and is up 77 cents to $9.63. Bullish flow detected in SVA options as well, with 5550 calls trading, or more than 2x the recent avg daily volume. Nov 10 calls are the most actives. 3196 traded (29 percent bid / 31 percent mid / and 40 percent ask). Implied volatility is elevated at 107.4 (-.4). Note: the biotech saw bullish flow last Friday as well on reports Beijing will extend an H1N1 flu vaccine innoculation to all the city’s 16 million residents. Shares are up 17.7 percent since that time.