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is it serious to get another Tdap immunization if you are...
is it serious to get another Tdap immunization if you are not sure if you have already been immunized?
If an adult is unsure if they have received the tetanus, diphtheria, pertussis (Tdap) vaccine, it is recommended that they get one dose of the vaccine. Getting an extra dose of a vaccine when your immunization history is unknown is not harmful and ensures protection.
Booster doses of tetanus-containing vaccines given too frequently may cause an increased local reaction. Your health care provider can provide you with more information regarding this.