CDC research shows the number of people who fainted after being vaccinated doubled since health officials recommended three new shots for adolescents in 2005 and 2006. About 63% of the fainting episodes occurred after patients received Merck & Co.'s cancer vaccine, Sanofi-Aventis' meningitis vaccine, and Sanofi and GlaxoSmithKline's shots against whooping cough, tetanus and diphtheria.

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