I don't know about in ponds, but I am suprised to hear a "physician" state that antibiotics can't make humans more susceptible to infection.
Antibiotics can and will kill off the beneficial normal flora in humans, paving the way for pathologic bacteria to cause illness.
Lrunkle, didn't they teach that at your med school? (ever hear of a a C. diff infection?)
I would be very cautious.
