Tracey, I don't know what the medical answer is, but I personally would not do them before you go now. It is too close if he does have a reaction. If you had been told to do it before you go earlier, it probably would have been ok to do it earlier this week, but now you fly out the day after tomorrow. As far as I am aware Zyon will not be at a huge risk of contracting tetanus or polio on the flight or in Bali so I can't see why that would be a big issue. I think the only issue, as Caro has raised, is the effectiveness if there is more than 2 months between doses, but I am sure they delay for a sick baby so it should be ok. Maybe you can ring a GP and ask them?