Feline Panleukopenia (FPLV), often referred to as feline parvo or feline distemper, is a highly contagious and potentially fatal infectious disease in cats. The virus responsible for FPLV is considered ubiquitous, meaning it is present in virtually every environment that has not been thoroughly disinfected. This widespread presence makes vaccination against FPLV a critical component of feline healthcare, deemed a "core" vaccine essential for all domestic
cats, including those kept exclusively indoors, due to the risk of fomite transmission.
Kittens are particularly vulnerable to FPLV, especially during the period when maternal antibodies wane and vaccine-induced immunity has not yet fully developed. Free-roaming cats are commonly exposed to the virus within their first year of life. Those that survive an acute illness or develop a subclinical infection typically develop a robust and long-lasting protective immune response. Understanding the nature of this virus and the protective measures available is vital for cat owners.
Transmission and Persistence of FPLV
FPLV is highly contagious among unvaccinated cats. An infected cat sheds large quantities of the virus in all bodily secretions, including feces, vomit, urine, saliva, and mucus, during the acute phase of the illness. This shedding can continue for up to six weeks after recovery. Even subclinically ill cats can shed the virus, contributing to its spread. The virus can be transferred on contaminated objects like bedding or food dishes, on fur, or by other animals, fleas, and humans, acting as fomites.
One of the most challenging aspects of FPLV is its extreme resistance to inactivation. Like all parvoviruses, FPLV can survive in a suitable environment for over a year, persisting long after visible signs of the original body secretions have disappeared. This resilience means the virus can be transported over long distances, posing a continuous threat. Cases of kitten deaths have been reported even in households with fully vaccinated adult cats, likely due to exposure to significant amounts of the virus in the environment.
Diagnosis and Treatment of FPLV
A presumptive clinical diagnosis of FPLV is often made for kittens based on their signalment, history, clinical findings, and lack of prior vaccination. This diagnosis is typically supported by detecting parvovirus antigen in feces using tests like ELISA (enzyme-linked immunosorbent assay) and PCR (polymerase chain reaction) assays. While PCR assays are highly sensitive, they can sometimes yield false positive results in recently vaccinated cats due to the shedding of attenuated parvoviruses from modified-live vaccines. Some ELISA tests, originally designed for canine parvovirus, are known to detect FPLV in feline feces and can be performed in a veterinary clinic, offering rapid and inexpensive detection.
Treatment for FPLV requires immediate and aggressive intervention, as the disease can be fatal in less than 24 hours. Cats suspected or diagnosed with FPLV must be isolated to contain the virus. Treatment typically involves anti-emetics, intravenous (IV) antibiotics, IV fluids with electrolytes, vitamin B injections, and potentially plasma or whole blood transfusions. Continued feeding with a highly digestible diet is crucial, or parenteral nutrition for anorexic, hypoproteinemic, vomiting, and diarrheic cats. In outbreak situations, unvaccinated kittens or adults may receive anti-FPV serum containing antibodies for short-term protection.
Vaccination Schedule for FPLV
The FPLV vaccination is a core vaccine recommended for all domestic cats. For kittens at high risk, vaccination can commence as early as 4 weeks of age, with subsequent boosters administered every 3–4 weeks until they reach 16 weeks of age. For cats older than 16 weeks, the general recommendation is two doses, given 3 to 4 weeks apart, followed by a booster vaccination 6 months to 1 year later. After this initial series, a booster vaccination every 3 years is typically advised. Alternatively, a blood titer test can be performed to assess individual antibody levels, allowing for a more customized approach to booster timing.
