Companion Cat FIV: Living Well with Feline Immunodeficiency Virus

Feline Immunodeficiency Virus (FIV) is widely misunderstood, and most FIV-positive cats can live long, comfortable lives with appropriate care.

Key Facts

FIV affects approximately 2-4% of cats globally, with higher rates in outdoor and feral populations
FIV is transmitted primarily through deep bite wounds — casual contact between cats rarely spreads the virus
FIV-positive cats can live for many years without developing AIDS-like symptoms
The virus weakens the immune system over time, making secondary infections more likely
FIV-positive cats should receive twice-yearly veterinary check-ups rather than annual visits
A killed-virus FIV vaccine exists but interferes with diagnostic testing, limiting its practical use
Indoor-only housing for FIV-positive cats protects them from secondary infections and prevents transmission
Many shelters euthanise FIV-positive cats unnecessarily — rescue and education efforts are changing this

Welfare Considerations

FIV-positive cats face a welfare challenge compounded by misunderstanding: many are euthanised in shelters when they could live happily for years. The immune compromise is gradual, and with attentive monitoring, prompt treatment of secondary infections, and indoor management, FIV-positive cats routinely enjoy the same quality of life as uninfected cats for most of their lives. Welfare management focuses on minimising infection exposure (indoor housing, parasite prevention, dental care), recognising early signs of immune compromise, and building a veterinary partnership that monitors lymphocyte counts and body condition over time. Adoption advocacy for FIV-positive cats is one of the highest-impact companion animal welfare actions available.

What You Can Do

Consider adopting an FIV-positive cat from a shelter — they make wonderful companions
Keep FIV-positive cats strictly indoors to protect them and prevent transmission
Schedule twice-yearly veterinary check-ups for FIV-positive cats
Ensure excellent dental hygiene as oral infections are common immune-compromise complications
Share accurate FIV information with your network to combat myths that lead to unnecessary euthanasia
Support shelters and rescues that have FIV-positive adoption programmes rather than euthanasia policies