Can a cat survive FIP on its own?

A cat generally cannot overcome FIP by itself. Feline infectious peritonitis has a fatality rate above 90% and almost no chance of self-recovery; untreated cats usually die, and no spontaneous-recovery cases are documented. Dry FIP lasts 3 to 16 weeks, wet FIP 3 to 9 weeks. The specific drugs GS-376 and GS-441524 help, with 441 being more effective if given promptly.