Who is at Risk?
The individuals most at risk of infection are outdoor cats,
indoor/outdoor cats, and cats
exposed to infected individuals. Cats living in households
cats or with cats of unknown infection status are also at risk.
with no exposure to potentially infected cats are extremely unlikely to
become infected. The virus is particularly dangerous to
kittens and young
cats. Acquired immunity to FeLV is based on humoral and
Results of an experimental challenge study indicate that resistance
increases with maturity.
However, age-related resistance to infection is not absolute, and adult
cats may be vulnerable
to infection. In several studies involving experimental challenge of
vaccinated and non-vaccinated
control cats, at least 50% of adult control cats became infected.
AVMA, 2004; Harbour et al., 2000; Hartman, 2006; Hofmann et al., 1995; Levy, 2000; Poulet et al., 2003