What is a common sign of feline calicivirus infection in cats?

Feline calicivirus (FCV) is primarily known for causing respiratory infections in cats. One of the hallmark signs of this infection is the manifestation of respiratory symptoms, which can include sneezing, nasal congestion, and conjunctivitis. These symptoms often occur due to the virus's impact on the upper respiratory tract, resulting in inflammation and discomfort for the cat.

In contrast, while skin lesions can occur with various conditions in cats, they are not a common indicator of FCV. Similarly, digestive distress and neurological issues are associated with different diseases and not typically linked to feline calicivirus. Therefore, recognizing respiratory symptoms as the most common sign of FCV can aid in prompt diagnosis and treatment, emphasizing the importance of awareness of this particular disease in feline health.