Between November of last year and this past January, the FDA “cited 49 areas of concern, including a failure to follow good manufacturing practices” at Merck & Co. Inc’s vaccine plant in Pennsylvania. A Merck spokesman says that most of the incidents were found and reported by Merck’s own employees, and that they occurred in the manufacturing process, not the vaccines themselves: “He stressed that no contamination was found in finished vaccines and that Merck was addressing all the problems.”