Hi Rooey, I'm still undecided about vaccination but even if these parents have children that are fully vaxed due to chronic illness, they should be just as worried about their kids being around vaccinated kids, because as you said they are not always 100% covered, can still contract the diseases, and pass them on, so the logic is still not there, IYKWIM
Yes, potentially that could be the case. However, as I mentioned earlier, vaccinated kids are less likely to become ill in the first place and if they do it will be a lesser form of the illness. Having a less severe form of the illness means you are less likely to pass it on to other vaccinated kids as they already have a degree of immunity.

Immunisations are meant to protect the community as a whole, but that does fall down when (I think) immunisation rates drop below 90%.

Satya, good point.