Tetanus, diphtheria and pertussis vaccination rates were 24% among individuals aged 11 and older who tested positive for whooping cough, and 32% in negative-testers, according to a study in the journal BMJ. After considering gender, age, race and immunization history, researchers said that the effectiveness rate of the vaccine in preventing whooping cough was between 53% to 64%. The currently used vaccine is acellular, which studies indicate is weaker than previous vaccines.

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