How cats become infected with feline coronavirus, the virus which causes FIP

Feline coronavirus (FCoV), which causes feline infectious peritonitis (FIP), is shed in the faeces. FCoV infection occurs when cats ingest (or inhale) the virus. FCoV is a very contagious virus and it only takes a tiny speck of cat litter dust from a litter tray previously used by an infected cat for the virus to spread. FCoV is a moderately stable virus, lasting up to 7 weeks in the environment (so it is not as stable as parvovirus, which can survive for a year, but is a lot more stable than feline