Cerus Co. (NASDAQ:CERS – Get Free Report) saw a significant growth in short interest in January. As of January 31st, there was short interest totalling 4,480,000 shares, a growth of 5.9% from the January 15th total of 4,230,000 shares. Based on an average trading volume of 1,420,000 shares, the short-interest ratio is presently 3.2 days. […]