Calicivirus

Calicivirus refers to a genus of small, non-enveloped RNA viruses belonging to the family Caliciviridae. These viruses are known for their distinctive cup-shaped or "calice-like" depressions on their surface, which is where their name originates. Caliciviruses are found worldwide and infect a wide range of hosts, including humans, cats, dogs, rabbits, and marine mammals.

In humans, the most well-known calicivirus is norovirus, a leading cause of gastroenteritis, commonly referred to as the "stomach flu." Norovirus outbreaks are frequently associated with contaminated food, water, or surfaces, and can spread rapidly in close-quarters settings like cruise ships, schools, and nursing homes. Symptoms typically include nausea, vomiting, diarrhea, and abdominal cramps. Another human calicivirus, sapovirus, also causes gastroenteritis, though it is generally considered less common than norovirus.

In cats, feline calicivirus (FCV) is a prevalent cause of upper respiratory infections, often referred to as "cat flu." FCV can cause a variety of symptoms, including sneezing, nasal discharge, conjunctivitis, and oral ulcers. While most cats recover from FCV infections, some strains can be more severe, leading to pneumonia or chronic oral disease. In dogs, canine calicivirus has been identified as a cause of respiratory and gastrointestinal illness.

Diagnosis of calicivirus infections often involves laboratory testing, such as RT-PCR or antigen detection assays, depending on the host and suspected virus. Prevention strategies include good hygiene practices, proper sanitation, and vaccination where available, such as for FCV in cats. There is no specific antiviral treatment for most calicivirus infections, and management typically involves supportive care to alleviate symptoms.