I've had one bout of pneumonia (which encompasses a wide, wide variety of things) since my tx (February of '07, if you want to check the archives). And it sort of sucks, because you have to figure out 1) is there rejection 2) is it rejection and infection, or just infection? and then 3) how to treat whatever it is while still keeping the organs happy. It is a very fine line and can involve a lot of back and forth.
So prayers are necessary!
More info at CF husband.