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FIP in Cats: Symptoms, Treatment and Prevention

July 1, 2026
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FIP in Cats: Symptoms, Treatment and Prevention

What is FIP, how is it transmitted, what are the symptoms? A comprehensive guide on GS-441524 treatment and prevention methods.

What is FIP?

FIP (Feline Infectious Peritonitis) is a serious disease caused by a mutation of the Feline Coronavirus (FCoV). Once considered almost 100% fatal, FIP can now be treated with antiviral drugs like GS-441524, with recovery rates between 84-90%.

The Coronavirus Connection

About 40-80% of cats carry Feline Coronavirus (FCoV). This virus is mostly harmless, causing mild digestive symptoms or no symptoms at all. However, in about 5-10% of cases, the virus mutates and develops into FIP.

FCoV belongs to the same family (Coronaviridae) as the human COVID-19 virus (SARS-CoV-2), but they are different viruses and do not cross between species. Interestingly, GS-441524 used in FIP treatment shares the same active metabolite as Remdesivir, used in COVID-19 treatment.

Types of FIP

Wet (Effusive) FIP

The faster-progressing form. Fluid accumulation occurs in the abdominal or chest cavities. Abdominal swelling, difficulty breathing, and rapid weight loss are the most prominent symptoms.

Dry (Non-effusive) FIP

Progresses more slowly and is harder to diagnose. Granulomatous lesions form in organs (kidneys, liver, spleen, eyes, brain). Eye inflammation, neurological symptoms, and organ failure may occur.

Symptoms

  • Persistent fever: Fever not responding to antibiotics (39.5C and above)
  • Loss of appetite and weight loss
  • Abdominal swelling: Due to fluid accumulation in wet FIP
  • Breathing difficulties: When fluid accumulates in the chest
  • Jaundice: Yellowing of eyes and gums with liver involvement
  • Eye problems: Cloudy eyes, iris color changes
  • Neurological signs: Walking difficulty, balance loss, seizures

Treatment: GS-441524

GS-441524 has revolutionized FIP treatment. Clinical studies since 2019 have shown recovery rates of 84-90%. Treatment typically lasts 84 days with oral tablets or subcutaneous injections, with dosage determined by the veterinarian based on the cat's weight and FIP type.

Prevention

  • Maintain proper litter box hygiene
  • Manage stress through gradual environmental changes
  • Avoid overcrowding with too many cats
  • Regular veterinary check-ups for early detection
  • Quarantine new cats for 2 weeks

Track Your Cat's Health with Petinom

During FIP treatment, regular monitoring is crucial. With Petinom, you can track your cat's treatment progress, vaccination records, and veterinary appointments all in one place.