A beloved household cat has made an “astonishing” recovery from a usually fatal illness, thanks to a drug made to treat Covid-19 in humans – and a quick-thinking vet. But in the past decade, studies have shown that antivirals can be effective in treating FIP – particularly a drug referred to as GS-441524, and relative remdesivir. Molnupiravir was approved in New Zealand to treat Covid-19 in the community, but was considered about half as effective as Paxlovid