My doctor said to GET IT! He actually forgot to address it with me during our appt (we spent awhile trying to figure out gender), so he chased me down as I was leaving to talk about it. I got the the one with thermisaol ... I hope it's okay. I found research, of course after, saying that there is no causal relationship between the mercury and autism. And the mercury used in the shot is actually different from the mercury used in the research - it's not as harmful. I am a non-vaccinator, but I decided to get this one b/c the benefits outweigh the risk, for me, in this situation.