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I am sorry to hear Jawless has feline distemper. My name is Rebecca. I am a veterinarian and will do my best to help.
In addition to Cerenia, and fluids and the critical care slurry, I would consider giving a transfusion of serum or plasma from a cat that is vaccinated for distemper to get some anti-distemper antibodies into him.
I would probably not give him gentamicin; it is hard on the kidneys, especially in a cat that may not be fully hydrated, and antibiotics are not effective against this virus.
If there is diarrhea, I would be giving metronidazole.
Is it proven he has feline distemper? It is not very common in cats older than kittens.
Let me know what other questions I can help with and how he is doing.
A low WBC is good reason to suspect distemper.
I would give a cat this size about 80 to 100 mg metronidazole twice daily if he can keep it down.
A transfusion might really help if you can get some plasma (whole blood collected with Hetastarch or heparin and then separate the cells out) or whole blood into him.
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