>>>I still don't understand the logic. If you choose not to be immunised against a particular disease and everyone else has been then to whom do you pose a threat?
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>>Once there is more than 1 person that didn't get a vaccination, there is a threat. Only if there is exactly one person that didn't get a vaccine in the entire world there is no threat to anyone (though we don't know if the vaccine is 100% effective).
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>Yes exactly. Also, people not getting vaccinated can become a growing bed for the viruses to grow and mutate

It's actually a very complex and serious topic. A couple of years back I read a book (forgot now the author, but I have it at home) about vaccinations and some serious side effects in some cases. Based on this book I refused to have all vaccinations for my younger child, so he is now a little bit behind (we catch up on most of the vaccinations later)