What is Feline Calicivirus or Caliciviridae

Feline Calicivirus (FCV) is a virus that belongs to the family Caliciviridae. It primarily affects cats and is one of the major causes of upper respiratory infections and oral disease in felines. FCV is highly contagious and can spread rapidly among cats, especially in crowded or multi-cat environments such as shelters, catteries, and households with multiple cats. Feline Calicivirus (FCV) is a common viral pathogen that primarily affects domestic cats. It's one of the main causes of upper respiratory infections in cats, along with the feline herpesvirus. In addition to respiratory signs, FCV can cause oral ulceration, lameness, and sometimes more systemic disease.


FCV is primarily transmitted through direct contact with infected cats or their secretions, such as saliva, nasal discharge, and urine. It can also spread indirectly through contaminated objects like food bowls, grooming tools, and human hands or clothing. The virus can survive in the environment for a certain period, allowing it to infect cats that come into contact with contaminated surfaces.


The symptoms of FCV infection can vary widely and range from mild to severe. Common signs include:

It's important to note that FCV symptoms can vary widely, and not all cats will exhibit every symptom. The severity of symptoms can also vary, from mild sneezing and nasal discharge to severe pneumonia and oral ulcerations. Additionally, some cats can be carriers of the virus without showing clinical signs themselves but still pose a risk of spreading the virus to other cats.

If you suspect that your cat might have FCV or is displaying any unusual symptoms, it's recommended to consult a veterinarian for proper diagnosis and treatment


There is no specific antiviral treatment for FCV. Management focuses on supportive care to alleviate symptoms and prevent secondary bacterial infections. This might include antibiotics to treat bacterial complications, pain medication for oral ulcers, and fluids to keep the cat hydrated. Proper nutrition is crucial to ensure affected cats continue to eat despite oral discomfort. 


The best defense against FCV is vaccination. However, as there are different strains of the virus, no vaccine offers complete protection. Still, vaccination can help reduce the severity and duration of the disease. Regular cleaning and disinfection of surfaces, bowls, and litter trays can also help reduce the risk of transmission.

In conclusion, while FCV can be concerning, especially in multi-cat environments like shelters, with early intervention and supportive care, many cats recover without complications. Always consult with a veterinarian if you suspect your cat might be infected.


There are various strains of FCV, and some might cause more severe disease than others. Over time, as with many viruses, new strains can emerge.

Genetic Information and Current Understanding

FCV is a RNA virus, meaning it carries its genetic information in the form of ribonucleic acid. Its genetic makeup can change over time, leading to the emergence of new strains with different properties. This genetic diversity poses challenges for developing effective vaccines and treatments.

Vaccination is the primary method for preventing FCV infection. However, due to the variability of FCV strains, vaccines may not provide complete protection against all strains. In some cases, vaccinated cats can still contract and spread the virus, but the severity of symptoms might be reduced.

It's important for cat owners to work closely with veterinarians to ensure their cats are vaccinated, receive appropriate care if they show symptoms, and follow proper hygiene practices to prevent the spread of FCV and other infectious diseases among felines.

What is a ribonucleic acid?

Ribonucleic acid, or RNA, is a vital molecule found in cells that plays a central role in various biological processes. There isn't a specific "genetic form" of RNA, but RNA is closely associated with genetic information and gene expression in cells.

DNA (deoxyribonucleic acid) is the primary genetic material that stores the genetic instructions necessary for an organism's growth, development, and functioning. RNA, on the other hand, is involved in the process of translating these genetic instructions into functional proteins.

There are several types of RNA, each with specific functions.

RNA is a diverse group of molecules that are involved in various aspects of gene expression and protein synthesis. While DNA contains the genetic information, RNA serves as the intermediary that transfers this information to the ribosome, where proteins are synthesized. The different types of RNA work together to ensure accurate and efficient protein production and contribute to the overall functioning of cells and organisms.