LOS ANGELES--(BUSINESS WIRE)--The controversy around Merck and Co. Pharmaceuticals’ pricing for its key AIDS drug Isentress — at nearly $13,000 per patient yearly, the most expensive first line AIDS therapy on the US market today — continued this week following Merck’s reaction to recent public criticism of its AIDS drug pricing. Merck ramped up its damage control PR efforts, issuing a press release that sought to rewrite the history of Isentress and deflect attention by claiming AIDS Healthcare Foundation has been unfairly attacking them.