On the plus side, a compound closely related to remdesivir (the drug to which remdesivir is the prodrug) showed great promise in curing this disorder (also known as FIP, Feline Infectious Peritonitis). Gilead stopped the trial because it might have interfered with marketing for human diseases, but if remdesivir goes into large scale production, as now seems likely, cats and their owners will benefit.
iirc there's a sort of black market for concerned cat owners getting an experimental (but apparently quite effective) drug for feline leukemia. there's Facebook groups you can join where they'll check you're not a fed and they'll direct you to a supplier.
