Maybe this is a dumb question; I never thought about it until the vaccination threads these past couple of days. I know the Tdap vaccine is for tetanus, diptheria and pertussis, but do all tetanus shots contain all 3/are all tetanus shots Tdap? DH and I both had a tetanus shot a couple of years ago but I don't recall hearing about the other 2 things. Is it safe to assume we're in the clear or is it possible to get just a tetanus shot with no other protection?