People who are given the standard vaccine for whooping cough may still carry and spread the infection, according to a study published in the Proceedings of the National Academy of Sciences. Researchers tested the vaccine on infant baboons, then exposed them and unvaccinated baboons to the Bordetella pertussis virus when they were 7 months old. The unvaccinated baboons got sick, but the group with the standard vaccine had no severe symptoms but still carried the bacteria and could transmit them to others, Food and Drug Administration researchers suggest.

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