Feline calicivirus is caused by contact with feces and secretions of sick cats. If your cat is found to have symptoms such as drooling, red and swollen gums, and severe pain, it may be due to calicivirus infection. It is recommended that the pet owner take the cat to the pet hospital for professional diagnosis and treatment according to the guidance of the doctor.

Symptoms of feline calicivirus:

1. The most obvious is the inflammation and congestion of the conjunctiva of the eyes and the increase of tear stains. The owner can observe whether the conjunctiva is congested by gently turning the cat's eyelids down.

2. There is discharge from the nose, similar to a runny nose caused by a cold.

3. Stomatitis: The teeth are red and swollen, the mouth has a bad taste, and red ulcers are attached to the gums. This is also more obvious as the owner needs to open the cat's teeth for observation.

4. Appetite decreases and the number of sneezing gradually increases.

5. Some cats with poor resistance will have a fever, which may reach around 40 degrees.