why do adults need the tdap
1 Because of the rise in US pertussis cases, some people should not wait 10 years to get their Tdap booster. 2  Pregnant women especially need Tdap vaccine because of the protection it provides against whooping cough. 3  They should get it late in the second trimester or in the third trimester.
1 The whooping cough booster is a combination vaccine with tetanus and diphtheria. 2  The vaccine is called Tdap. 3  Once an adult gets the Tdap vaccine, he or she should get the Td (tetanus and diphtheria) booster every 10 years from then on.