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In 2003, an urgent concern about bioterrorism drove the health care community to mobilize and deliver smallpox vaccine to health care workers across the country. The Department of Health and Human Services called for vaccination of 500,000 health care workers nationwide. Yet vaccination efforts waned as reports arose about adverse cardiac events. Within six months, the program was all but over. About 40,000 health care workers had been vaccinated.

IOM: CDC never made a case for smallpox vaccine