In answer to a few questions on here.
DuelingFanjo,
Having seen a programme on viruses, a professor explained why they were more prevalent in winter. You normally pick them up from touching surfaces which an infected person has touched (hence the way handwashing helps). Their survival times are temperature dependent. In summer, maybe a few hours but in winter 2-3 days.
Why vaccinate pregnant women?
Pregnancy is an immunosuppressed state. Women's bodies have to suppress a part of their immune system in order not to reject the foetus/embryo. However the cost is it works less well against infectious disease.
How dangerous is it to the baby:
In the first trimester, quite dangerous. Beyond then, the main danger is to the mother, although the baby can get distressed. Tangle's story above is very distressing yet it is the exception rather than the rule with most fevers. However, the danger to the mother is not minimal.
How dangerous are vaccines:
Ahh, the contentious one. Everything I have ever read or heard (and I have looked around a lot and discussed it with senior doctors etc) has led me to believe that they are very safe. The anti MMR story has been discredited and the anti vaccine loby are now left with the "oh, if you have a mitochondrial DNA defect, it might be dangerous". Well, yes it might but that is 1/30,000 instead of the much larger probability of getting really sick or worse from a dangerous disease.
My wife is in her third trimester and recently spent a night in hospital with a viral disease which might have been flu. The baby's heartrate was up to 200 (when the doctor finally found it). It was a really unpleasant experience for all of us.
I would seriously advise anyone who is pregnant to get vaccinated if they can.