That scares me..re: the wife. She is pregnant and the last thing she needs is this.
try not to worry about this too much. my wife seemed to pick up extra imunities when pregnant. I don't know if there is any scientific evedence to back it up, just my observation and simular stories from other people I've talked to.
but through all 3 of my wifes pregnancys, at least once she managed to be the only person missed when the flu (cold, whatever) would get just about everybody.
we even had one with the second child where you get sick then get well and then re-catch it from the others who where sick. it just kept going around at work and at home. and just about everyone had it atlest twice that winter but she never caught it.
of course we did our best to keep her away from the sick people but I don't think that would explain the whole thing. I think they get a little extra boost that gives them better odds at beatting sickness before it sets in.