 Oxford Immunotec Global PLC NASDAQ:OXFD saw a large increase in short interest in April. As of April 15th, there was short interest totalling 473,300 shares, an increase of 12.0 from the March 31st total of 422,600 shares. Based on an average daily volume of 209,600 shares, the short-interest ratio is presently 2.3 days. Approximately 1.9 ... 