The development of effective antiviral treatments for FIP has transformed this formerly fatal disease into a manageable condition with profound welfare implications.
The FIP antiviral treatment revolution represents one of the most dramatic welfare improvements in feline medicine in recent decades. Before GS-441524 availability, FIP diagnosis was effectively a death sentence — the disease caused progressive, distressing deterioration over weeks to months with no effective treatment options. Euthanasia was the only humane endpoint. The availability of effective antivirals has transformed this: cats that previously would have suffered and died can now achieve clinical remission and long-term survival. The welfare challenge has shifted from managing inevitable decline to ensuring treatment access — cost and regulatory availability create welfare inequity between cats in different economic circumstances and jurisdictions. The ongoing campaign for formal regulatory approval and reduced cost is fundamentally a welfare campaign.