I don't mean to scare you, but it could be FIP.

Has your vet mentioned using baby aspiring to bring down the fever? It worked with Ginger. Adult cats can get one baby aspirin every three days (too much aspirin can kill cats).  I have no idea how much a kitten that small would get, or if it is even safe, so please do not try it without talking to the vet first.

Michelle

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