Hi Customer (name blocked for privacy),
The kitten must have some problem in addition to the fly attack. Diarrhea and lethargy are not normal in an 8 week old.
Did you do right taking him to the vet? most definitely.
Did you do right leaving him there, at least for tonight? Yes.
Kitty needs as little stress now as possible, plus several other things. Were the hospital people going to do any other things for him than trim the hair and clean him up?
Fly strike, which is what the fly did to the kitten, is a very dangerous situation. It can happen in a matter of 10 minutes, and in a matter of a day or so, these eggs will hatch and the larvae will begin to migrate through the fecal material. When they reach the skin they will burrow in and travel just under the skin, eating as they go. Hopefully, your trip to the vet got the eggs off in time, and kitty might recover from it's underlying problem.
Keep a close eye on the other kittens. Flys don't seem to bother animals, unless there is a moist area, or an open sore, or fecal material on their coats. Watch for kittens that are doing poorly.
Stray cats are usually unvaccinated, and consequently often affected by one of several relatively nasty cat diseases. Kittens are especially susceptible, and most die in spite of our efforts to save the sick ones.
If your kitten passes away at the vet's tonight, rest more easily knowing that you did more than a lot of people would have done.
Best wishes
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