Someone correct me if I am wrong but I believe there is no Mercury in vax in Australia??? Or not in the ones given to kids? ETA I put up a link....
You beat me to it. Everything I have been able to find says that there is no longer any thimerosal in any kids vaccines - and hasn't been since... well a long time ago.

I agree, the vaccination decision is a scary one, and not one that most parents take lightly. I am relieved that DS is fully vaccinated so that when this bub comes soon there is far less chance of him bringing something home.

You have to do what you are comfortable with and unfortunately for every person that gives you a convincing argument one way there'll be another one the other way. Good luck with your decision.