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I am sorry that you have been waiting for a response. I recently just logged onto the site and noted that your question hasn't yet been answered. I am a licensed veterinarian with over 25 years’ experience and would be happy work with you if you are still needing assistance.
Can you tell me how long he has been like this?
Do you have an estimate of how much he weighs?
Is he conscious and aware of his surroundings?
How and where did you find him?
I am sorry to hear that. Please be careful in handling him. You may want to contact your local department of public health and see if they would like you to submit him for rabies testing.
It is a long shot, but any pet that dies after showing neurologic signs has to be considered a possible rabies carrying case. You can call a local ER to see if they can help you out.
Being a kitten born to a stray mom, it could be due to any of the other viral diseases. Feline leukemia, Feline aids, Panleukopenia (distemper). Toxoplasmosis has to be on the list also. Any of these can affect neurologic tissue and lead to the kind of signs you were seeing.
Rabies is not out of the question however and you never know what he may have been exposed to. Rabies symptoms are not classic and can present differently in various animals. Just trying to be careful for your protection. I have been a vet for over 30 years and still am alerted to cases where no one thought is could be rabies and it was.