Pretty well my only reading about vaccination has come from BB (though I have often floowed links to papers or related sites).

Trillian I am not suggesting that herd immunity is the only reason to not vax, but if someone would not vax in Australia but would in a country where the disease is prevalent then that appears to be a decision based on reliance on herd immunity, in the way that Heaven's appears to have been. As you would still not vax in such circumstances but instead rely on natural immunity, then your decision isn't. I'm not casting nasturiums () on a decision to not vax based on herd immunity, I am just curious to what extent people see it as a valid reason.

Limeslice, my understand that the concept of herd immunity (which I admit is from wikipedia only LOL!) is that it doesn't mean 100% but rather a lower % (I think for most diseases it is around 85%.

I am not attacking or questioning other reasoning on not vaccinating, but specifically the extent to which a herd immunity concept plays a part in decision making As I said in my OP, "if this is the reason behind non-vaccination, the non-vaxer is reliying on "herd immunity" which may eventually be reduced if great enough members of the "herd" were to also stop vaccinating" (with the emphasis on "if").