Re: only had 2 of the 3 three twinrex now what??
I did the same thing. I had my first two about two years ago and then forgot about the third. I'm going to get my third this coming week (when I get my seasonal and H1N1 flu shots). You don't have to start the series again, just go back for the third shot. It takes all three for full immunity so you have some now, just not the optimal immunity you would have after all three shots.