The Rivalta test is a simple one that your vet can do right there in the office. It is indicative of FIP but not absolutely diagnostic. But useful to help the diagnosis. FIP is very very difficult to diagnose.
Imho doing an elisa test on the fluid is not as absolute as doing the PCR test, and if they are doing the "FIP" ELISA test on a blood sample it is not very diagnostic at all.
The diagnosis related to the fluid in his belly is this: When a cat simply has Coronavirus that has not mutated and the cat does not have FIP, the virus is located in the gastrointestinal tract only. The cat will have a titer (the FIP ELISA test) because the body will see the virus in the gut and make antibodies... so a positive elisa of the blood only tells you the cat has been exposed to Coronavirus.
IF the fluid inside his belly is tested for the presence of the virus (not the presence of antibodies to the virus) and detects the virus, then that is pretty diagnostic for FIP. FIP happens when the virus mutates AND crosses the mucosal barrier of the gastrointestinal system and thus enters the lymphatic system. That's when the disease happens.
I strongly suggest that you (and your vet) check out the diagnostic flowchart on www.dr-addie.com
And I agree with Trish, the breeder should be notified!
Imho doing an elisa test on the fluid is not as absolute as doing the PCR test, and if they are doing the "FIP" ELISA test on a blood sample it is not very diagnostic at all.
The diagnosis related to the fluid in his belly is this: When a cat simply has Coronavirus that has not mutated and the cat does not have FIP, the virus is located in the gastrointestinal tract only. The cat will have a titer (the FIP ELISA test) because the body will see the virus in the gut and make antibodies... so a positive elisa of the blood only tells you the cat has been exposed to Coronavirus.
IF the fluid inside his belly is tested for the presence of the virus (not the presence of antibodies to the virus) and detects the virus, then that is pretty diagnostic for FIP. FIP happens when the virus mutates AND crosses the mucosal barrier of the gastrointestinal system and thus enters the lymphatic system. That's when the disease happens.
I strongly suggest that you (and your vet) check out the diagnostic flowchart on www.dr-addie.com
And I agree with Trish, the breeder should be notified!