I plan on attending nursing school in the summer and I am required to show proof of a recent TDAP booster. I received the booster in 2006 which was less than 10 years ago but I could not locate my records even after calling past schools I attended as well as the health department. So instead of getting re-vaccinated I got a titer. I received the titer results back and it showed my immunity. I turned that into the school and they rejected it stating that even though I am immune I still need to submit proof of vaccination. What I dont understand is, why cant that be used as proof. Since I received a TDAP booster in 2006, that would mean Im not due for another booster until 2016.