A study of the HPV vaccine Gardasil where CDC researchers analyzed 12,424 reports of side effects following injection with the vaccine has appeared in the Journal of the American Medical Association. The vaccine was approved in 2006 and 23 million doses have been given. Most of the side effects were mild and included dizziness, headache, and fainting but the study included more than 700 reports of serious medical problems, including blood clots, autoimmune disorders, and 32 cases of death. Many of the adverse event reports failed to provide enough information and most were submitted via the vaccine"s manufacturer, Merck & Company. The study showed that in patients receiving Gardasil blood clots reported were in higher numbers than in other vaccines. Many of the reports included women who were also on birth control pills that increase the risk of getting clots. According to Barbara Slade, the study"s lead author and a medical officer in the immunization safety office of the CDC, the potential of the vaccine to prevent cervical cancer continues to outweigh the risks that were reported in the study.
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