Vaccine. 2019 Nov 20; Pertussis vaccines given to pregnant woman interfere with the babies immune system which prevents development of pertussis antibodies by the newborn infant.

Pertussis antibodies transferred during pregnancy may decrease the risk of pertussis infection in the first months of life but interfere with the infant’s ability to produce pertussis antibodies, the clinical significance of which remains unknown. Safety and reactogenicity results were consistent with previous experience.

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