Ok I'll have a go at the ones I know
-Not to my knowledge- otherwise I may have given it to ds2 (I would like him to be protected against tetanus- buit not with mercury ta veyr much)
_pertussis leads to sever coughing- which can be so bad that the child becomes starved of oxygen. In practice it is nasty but manageable in children. It is dangerous in babies- especially iunder 6 months. However even in this group the mortality rate is very low. It is a nasty disease, but it is also a nasty vacine (according to the states the most dangerous of the childhood vaccinations) and I'm not convinced it works very well now. The new strain of pertussis seems to be less severe.
-Don;t know about IMOVAX
_NOt sure about european countries- just know the states uses dead polio.
-the risk of catching polio in a swimmingpool is abolsutely minimal- tinty tiny tiny -unless there are immune deficiencies- even then stil pretty small, but 1000's of times higher than a child with a normal immune sytem.
_No I think teething temps would be irrelevant. TBH temps are a good thing in the immune system anyway- having a temp after a vaccination at leats shows a response to the vaccination.
At a nursery? Hib, whooping cough and meningitis C. BUt menigitis C risk will be absolutely tiny tiny tiny, and hib and whooping cough will be higher but still not huge. Hib is probably the most problemtatic really.
It won't give give a great reposnse (well it could do but it would be unlikely to). The main problem with leaving a long gap is that you will increase your risk of allergic reactions to tetanus (I think) if you go ahead and give boosters at some stage.