Feline infectious peritonitis (FIP) is an infectious disease of cats, predominantly young cats. It occurs when feline enteric coronavirus multiplying in the intestines undergoes a critical mutation which changes its tissue tropism from enterocytes to macrophages. FIP virus then moves round the body in macrophages – the ultimate Trojan horse mechanism. This leads to a disseminated infection and the development of a fibrinoid necrotising vasculitis and serositis due to deposition of immune complexes consisting of cat antibodies and FIP viral antigens. 

After the promising results of adenosine nucleoside monophosphate prodrug GS-5734 usage to prevent some RNA viruses, the efficacy of its parent nucleoside GS-441524 against FIP (feline infectious peritonitis) started to be evaluated. This small molecule interferes directly with replicative processes encoded by the virus.

For optimal results, the medication dosage should remain the same even if the cat's weight decreases. However, if the cat's weight increases during treatment, the dose needs to be adjusted based on the initial weight or the highest weight during the treatment cycle.FIP is a serious disease, but early detection can help improve the chances of a positive outcome.If your cat is showing FIP in cats symptoms, please take them to your nearest veterinarian for proper diagnosis and treatment

Feline infectious peritonitis (FIP) is a viral disease caused by feline coronavirus (FCoV). This virus is a mutant of feline enteric coronavirus (FeCV) which cannot be easily defeated through a cat's natural immune response. FCoV will infect white blood cells and spread through the cat’s body. The disease is progressive and can be fatal if left unattended. It is estimated that this disease can kill 1.4% of cats around the world.FIP can be divided into two categories, the effusive (wet) form and the non-effusive (dry) form. Common symptoms of FIP include loss of appetite, fever, depression, and weight loss. Cats can evolve from one FIP form into another form from time to time.

The initial field testing of GS-441524 for FIP treatment involved subcutaneous injection. This  route of administration was based on prior pharmacokinetic (PK) studies done on laboratory cats.  Intravenous and subcutaneous routes of injection yielded similar high blood levels that were  sustained at virus inhibitory concentrations for over 24 hours. Oral administration was also found  to provide blood levels, peaking at 2 hours, but reaching only about 40% peak levels of  subcutaneous and intravenous routes (Pedersen NC, unpublished data, 2018). However, dogs  which have a longer intestinal tract evolved for omnivorous diets, can absorb up to 85% of  GS441524 by the oral route [1, 5]. Dogs have often been used as surrogates for humans in oral  absorption studies, so oral absorption in humans is also likely to be higher than in cats.

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