Liz Buchanan BVSc MRCVS
Keymaster
Hello - there are two forms of Feline corona virus. FCoV is really common in cats, to the extent that most cats (Dr Emi Barker of Bristol University, an expert in the field, says over 90%) have it. Sometimes FCoV positive cats might mutate into Feline Infectious Peritonitis Virus, FIPV, which is not thought to spread directly from cat to cat. Most cases of FCoV and FIPV are 'self limiting' with no or vague clinical signs, such as mild diarrhoea. Therefore, a positive test for them would not be particularly useful or enlightening. However, 1-5% of infected cats can develop Feline Infectious Peritonitis, which is a severe form of the virus in which the cat might, for example, get an exudate in the body cavities. This form is fatal.
Now, I am not so clear from your message what tests have been done here - or indeed, who by - or whether they are reliable, or what has found. Feline Coronavirus turns into FIP quite rarely and this can be associated with factors linked to the virus, the cat and the environment. It is worth asking your vet whether or not they feel you should be worried about your particular cat. It may turn out to be nothing at all to worry about in your cats' case.
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