Feline Calicivirus Welfare Management in Shelters

Feline calicivirus causes significant welfare problems in shelter settings through respiratory disease, oral ulceration and, in virulent systemic strains, life-threatening systemic disease.

Key Facts

FCV causes oral and upper respiratory disease in 10-50% of shelter cats — highly variable clinical severity depending on strain
Virulent systemic FCV (VS-FCV) causes severe systemic disease with facial oedema, skin ulceration, multi-organ failure and high mortality
FCV is highly contagious and environmentally stable — contaminated fomites spread infection rapidly in shared housing
Vaccination does not prevent infection but reduces clinical severity substantially — all shelter cats should be vaccinated on intake

Welfare Considerations

FCV welfare impacts in shelters range from mild discomfort (sneezing, mild oral ulcers) to life-threatening systemic disease in VS-FCV outbreaks. Oral ulceration causes significant pain that reduces food and water intake, complicating recovery and creating secondary nutritional welfare problems. Shelter outbreaks require isolation, enhanced hygiene and population management decisions that create additional welfare stresses through social disruption. Vaccination on intake, robust husbandry protocols and good population health management are the primary welfare protection tools.

What You Can Do

Vaccinate all incoming cats on shelter intake — even partial immunity from vaccination reduces FCV severity
Implement rigorous fomite hygiene — FCV survives on surfaces for weeks and is resistant to many disinfectants (use dilute bleach)
Isolate cats with respiratory or oral signs immediately from the general population
Provide highly palatable soft or liquid food to cats with oral ulceration to maintain nutrition during recovery