Feline Herpesvirus (FHV-1): Symptoms, Treatment, and Prevention Guide

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Introduction

Feline Herpesvirus-1 (FHV-1) is a very contagious virus that is the most common cause of URI among cats. After being infected by this virus, it remains within the cat’s body and can reoccur when the cat becomes stressed.

Close-up of a cat showing ocular and nasal discharge due to Feline Herpesvirus-1 infection.
Common clinical signs of FHV-1 include clear to mucopurulent discharge from the eyes and nose.


​​Modes of Transmission

​​The virus is transmitted via:

​​Direct Contact with Ocular/Nasal Secretions from the infected cat.

​​Inanimate Objects like food bowls, beds, and grooming instruments (fomites).

​​Short-Distance Aerosol Droplets, i.e., through sneezing and coughing.

​​Signs and Symptoms

​​Also known as feline viral rhinotracheitis (FVR), the typical symptoms include:

​​Difficulty Breathing: 

characterized by sneezing and nasal congestion.

​​Conjunctivitis: 

Inflammation of the eye linings, along with discharge.

​​Dendritic Keratitis: 

Small ulcers forming on the surface of the cornea in a dendritic pattern – a unique symptom of FHV-1 infection.

​​Anorexia and Lethargy: 

Lack of appetite and weakness.

​​Hypersalivation: 

Increased saliva production due to mouth ulcers.



Diagnosis

​​Herpesvirus infection in cats can be diagnosed by:

​​Clinical Symptoms: 

Identification of the particular eye ulcers.

​​PCR Test: 

Using eye or throat swab test to detect the viral DNA.

​​Fluorescein Staining: 

Helps detect corneal ulcers that are not clearly seen with the naked eye.

​​Management of Symptoms

​​Although there are no treatments for Herpesvirus, the symptoms can be controlled with:

​​Medication: 

Eye drops (Idoxuridine) or antiviral pills (Famciclovir).

​​L-Lysine Supplement: 

It often helps lessen the virus shedding and symptoms.

​​Supportive Treatment: 

Maintain cleanliness in the cat’s eyes and nose, and provide food.

​​Stress Avoidance: 

Try to keep the same environment to avoid triggering symptoms.

​​Prevention: Importance of Vaccination

​​FVRCP vaccine offers the best protection. Although it cannot prevent the infection, it will certainly reduce the severity of the disease and prevent severe complications.

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