Feline Calicivirus (FCV) is a highly contagious viral infection that affects domestic cats and is one of the major causes of upper respiratory disease in feline populations worldwide. It is especially common in environments where many cats are housed together, such as shelters, breeding facilities, and multi-cat households. The virus is known for its ability to spread quickly and mutate frequently, which makes it difficult to fully control.
FCV is transmitted primarily through direct contact with infected cats. The virus is present in saliva, nasal secretions, and eye discharge. It can spread when cats sneeze, groom each other, or share food and water bowls. Unlike some viruses, FCV can also survive in the environment for a period of time, meaning contaminated surfaces such as bedding, litter trays, and utensils can contribute to transmission.
The symptoms of feline calicivirus vary widely depending on the strain of the virus and the immune status of the infected cat. The most common signs include sneezing, nasal discharge, conjunctivitis, fever, and general lethargy. Many cats also develop painful ulcers in the mouth and on the tongue, which can lead to drooling, difficulty eating, and reduced appetite. In some cases, lameness or joint pain may occur due to inflammation in the limbs.
In more severe cases, certain virulent strains of FCV can cause systemic disease, known as virulent systemic feline calicivirus (VS-FCV). This form of the virus can lead to high fever, swelling of the face and limbs, skin ulcers, jaundice, and internal organ damage. VS-FCV is rare but can be life-threatening, with a higher mortality rate than typical upper respiratory infections.
Diagnosis of FCV is often based on clinical signs and history, especially during outbreaks. Laboratory testing such as PCR can detect viral genetic material from swabs taken from the mouth, nose, or eyes. However, because many cats may carry the virus without showing symptoms, interpretation of test results must be done carefully by a veterinarian.
There is no specific cure for feline calicivirus. Treatment focuses on supportive care and managing symptoms. This may include fluids to prevent dehydration, pain relief for oral ulcers, antibiotics to prevent secondary bacterial infections, and nutritional support for cats that are not eating well. In severe cases, hospitalization may be required to provide intensive care.
Prevention is an important part of controlling FCV. Vaccination is widely used and is considered a core vaccine for cats, although it does not always prevent infection entirely. Instead, it helps reduce the severity of illness and limits the spread of the virus. Good hygiene practices, such as disinfecting surfaces, isolating infected cats, and reducing overcrowding, are also essential in preventing outbreaks.
In conclusion, feline calicivirus is a common and highly contagious viral disease that affects the respiratory system and oral health of cats. While most cases are mild and manageable, some strains can cause severe illness. Through vaccination, proper hygiene, and supportive veterinary care, the impact of FCV can be significantly reduced, helping to protect both individual cats and larger feline populations.
