FIP is a fatal coronavirus-related disease that historically devastated affected cats but has been transformed by newly available antiviral treatments with high cure rates.
Before effective treatment, FIP caused progressive, painful deterioration over weeks to months. Affected cats struggled to breathe due to fluid accumulation or suffered from neurological symptoms as the brain was affected. The disease struck primarily young cats and kittens, causing immense suffering and grief to their caregivers. The development of effective antiviral treatments represents a major advance in feline welfare, but access remains limited by cost and legal status of medications in some regions.