Does vaccination reduce the virulence of the bacteria responsible for whooping cough?

Following an analysis of bacterial samples from infants with whooping cough, scientists from the National Reference Center (CNR) for Whooping Cough and other Bordetellosis have revealed that the most severe forms of the disease are associated with specific strains expressing a key vaccine antigen. This discovery suggests that the bacteria may have evolved into less virulent and therefore less dangerous forms because of mass vaccination.

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