Word: acellular
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...reasons for the shortages differ for each vaccine. For example, the DTaP (diphtheria, tetanus toxoids and acellular pertussis) vaccine got hit by a double whammy. One of its major producers, then called Wyeth Lederle Vaccines, left the market just as new rules to cut down the mercury in the vaccine began to take effect. Aventis, another major DTaP producer, was caught off guard and had trouble overhauling its manufacturing process while simultaneously ramping up production. Making vaccines isn't a particularly profitable business, so there isn't a lot of competition for the work...
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