Perkinelmer Inc. is aiming to boost its infectious disease testing footprint with the acquisition of Oxford Immunotec Global plc for $591 million in cash. The purchase, reported Thursday, will allow Perkinelmer to expand its current offerings with solutions for tuberculosis (TB) detection. Perkinelmer shares (NYSE:PKI) hit a high of $162.16 Thursday morning, before closing at $160.53 – up 2.66% from the Wednesday’s close of $156.37.