About 80 percent of the upper respiratory diseases in cats living in shelters emanate from the feline calicivirus and the feline herpesvirus. The feline herpesvirus (FHV) is transmitted among cats through direct contact with fluids (saliva and nasal secretions), inhaling of sneeze droplets, and exposure to contaminated environments such as food bowls, bedding, litter trays, and grooming materials.
Most cats contract FHV early in their lives. Upon infection, it will take two to five days for signs to show. This is the incubation period, and it’s when the cat is infectious. The signs of FHV are sneezing, salivation, runny eyes, nasal discharge, fever, oral ulceration, and dehydration. Chronic FHV can cause inflammation and infection of the cornea in the eye, but this is not common.
Veterinarians diagnose FHV by collecting ocular or nasal swabs and evaluating them. For treatment, they prescribe anti-viral drugs that help manage the symptoms of the disease. Good nursing care at this time is vital. Nutritional support is necessary with chronic infections. Sometimes, secondary bacterial infections arise alongside FHV. In such cases, antibiotic treatments are necessary.
Once a cat is infected, they become life-long carriers of the virus. However, the virus is inactive so they do not show signs and are not infectious. However, in some instances, FHV can reactivate because of triggers like a weakened immune system or stress. In such cases, cats will develop mild symptoms and may be infectious.
FHV vaccines are available, and veterinarians recommend them to kittens older than eight weeks. While they may still contract FHV after being vaccinated, the symptoms will be less severe.