Feline calicivirus (FCV) infection

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Mild epithelial defects after burst calicivirus aphthae ©Susann-Yvonne Mihaljevic

Feline calicivirus (FCV) is a highly contagious virus that is one of the major causes of upper respiratory infections (URIs) or cat flu in cats. This virus is ubiquitous and causes disease in cats all over the world. Together, FCV and feline herpesvirus cause the vast majority of URIs in cats.


What is FCV and how is it spread?

Hypersalivation due to oral ulcers after FCV infection.

Feline calicivirus (FCV) is a small virus that mainly causes acute upper respiratory infections (URIs) in cats, although it has been associated with some other diseases also (see below). The virus is readily transmitted between cats through:

•   Direct contact – through contact with saliva, ocular or nasal secretions.
•   Inhalation of sneeze droplets.
•   Sharing or food bowls and litter trays.
•   A contaminated environment (including bedding and grooming aids) – FCV can potentially survive up to a month in the environment, although probably often does not survive more than 7-14 days.

A characteristic of FCV is that the virus mutates readily during replication and this means that many different strains of the virus exist in nature, some of which are more pathogenic than others (ie, are a cause of more severe disease).


What are the clinical signs of FCV infection ?

•   Acute upper respiratory infection – Acute URI is the most common manifestation of FCV infection. Typical signs include sneezing, nasal discharge, ocular discharge, conjunctivitis, ulceration of the tongue, lethargy, inappetence and fever. Signs may last from a few days to a few weeks and vary in severity. In young kittens the virus may also cause pneumonia.

•   Gingivitis and stomatitis 

•   Limping syndrome – occasionally, in young cats in particular, infection with FCV may also cause joint inflammation (arthritis). This is a transient problem, usually only lasting a few days, but the kitten or cat may be extremely uncomfortable with painful joints during this time. Often, but not always, there will be signs of URI at the same time.


Calicivirus infection limping syndrome ©Uwe Truyen

Characteristic tongue map-shaped lesions due to FCV infection ©Marian C. Horzinek


•   Virulent systemic FCV infection – vsFCV – on rare occasions, outbreaks of disease have been reported with very much more pathogenic strains of FCV termed vsFCV. These are associated with mutations of the virus that allow infection to be established within different organs and in the cells that line blood vessels. This can result in severe disease including pneumonia, hepatitis (liver inflammation), pancreatitis, skin swelling and ulceration, and bleeding from the nose and intestine. Fortunately these outbreaks are very rare, but up to 50% or more of affected cats may die.


Virulent systemic calicivirus disease, excoriations of paws ©Uwe Truyen


VS-FCV virulent systemic disease ©Tim Gruffydd-Jones


Crusted lesions and ulcers due to VS-FCV infection ©Tim Gruffydd-Jones


How is FCV infection diagnosed?

In most cases, a specific diagnosis of FCV infection will not be required. The presence of typical signs of URI is enough for a presumptive diagnosis of FCV (and/or feline herpesvirus – FHV) infection. If a specific diagnosis is required, ocular or oral swabs can be submitted to a veterinary laboratory where the virus can be grown in culture or, more commonly, detected by PCR (a molecular technique for detecting the genetic material of the virus).


Treatment and management of FCV infections

FCV infections are frequently complicated by secondary bacterial infections, so supportive treatment with antibiotics is usually required. Good nursing care is critical and cats may need to be hospitalised for intravenous fluid therapy and nutritional support in severe cases. Steam inhalation or nebulisation may help in cases of severe nasal congestion and as the cat will not be able to smell food well, using tinned or sachet foods that are gently warmed will help.

In colonies of cats, any cat showing clinical signs should be isolated if at all possible, and strict hygiene should be ensured with disinfection, and use of separate feeding bowls, litter trays, implements etc, careful washing of hands, use of separate (or disposable) apron etc.


Vaccination against FCV

Vaccination for FCV is important for all cats. Two or three injections are recommended in kittens, starting at around 8 weeks of age. Cats should receive a booster at a year of age, and after that should receive further booster vaccines every 1-3 years. 

Vaccination does not necessarily prevent infection with FCV but will greatly reduce the severity of clinical disease. Additionally, as there are many different strains of the virus, it is difficult to design a vaccine that will protect against all of them. Some newer vaccines incorporate more than one strain of FCV to provide a broader range of protection.


Source: http://icatcare.org/advice/cat-health/feline-calicivirus-fcv-infection-0

Images: http://www.abcdcatsvets.org/feline-calicivirus-infection-2012-edition/