Disease or Vaccine: Only way you can have positive antibodies in your blood is if you have received the vaccines and other way is if you have had the infection in the past By getting the vaccine your body produces the antibodies which protects you against the infection if you are exposed to it I will advice get the shot.But you are 34.you might have had MMR in childhood.Get your blodd checked.Get your tdap every10yrs
Answered 12/2/2015
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