Re: hepatitis b vaccine
It's most likely a false positive. If you received all three doses of the vaccine, you should be protected. I remember when i got mine, they did a titer three months after my last vaccination to make sure it took. I got the Hepatitis A & B vaccine together in the same shot, a vaccine called Twinrix. Hepatitis B is caused by being exposed to someones bodily fluids, usually during sex, but also like sharing a toothbrush with someone that was infected. Once you get the series of three vaccinations, there are no boosters currently reccomended.