FIP is a relatively rare but fatal viral disease. It is caused by infection with the virus called feline coronavirus. It is important to note that this is different from COVID-19. Feline coronavirus causes only mild symptoms — the kitten suffers from diarrhoea for a few days and nothing more. In some cases, however, it mutates, causing FIP. It has three forms:
Symptoms of the “wet”, or effusive, form
In this form of the disease, fluid builds up in the abdomen, which makes a swollen belly one of the most obvious signs. This can also happen in the chest cavity, causing breathing problems. But other diseases can cause this fluid build-up too, so it is important to wait for a clearer diagnosis from your veterinarian before a presumptive diagnosis is made.
Symptoms of the ‘dry’, or non-effusive, form
In this case of FIP in cats there will be minimal fluid build-up and the symptoms will be vague and not specific to a single disease: weight loss, vomiting or lethargy. Inflammation may also develop and affect various organs such as the eyes, kidneys, lungs or skin.
Neurological and ocular form: These affect the nervous system (tremors, paralysis) or the eyes (inflammation, a change in colour).
Treatment Until a few years ago FIP was considered incurable and a fatal outcome was inevitable. Today there are effective antiviral drugs (such as GS-441524) that successfully neutralise the mutated virus and save the lives of sick cats.