Feline Herpes Virus Explained: How Cats Catch It, What It Looks Like, and How to Manage Flare-Ups

Feline herpes virus, or feline herpesvirus type 1 (FHV-1) is also known as feline viral rhinotracheitis. It is a common concern for cat owners as it is contagious between cats and typically lifelong.

If you notice your cat sneezing, with watery eyes, a sticky discharge, and other common “cold” symptoms that keep coming back, it could be feline herpes. In this guide, we take a detailed look at symptoms, how it spreads, and vet diagnosis and treatment options.

Read on for prevention tips and advice on reducing flare-ups, and remember to seek urgent vet care if your cat is experiencing breathing difficulty or a complete loss of appetite.

What Is Feline Herpes (FHV-1) and Why Is It So Common?

Feline herpes, or feline viral rhinotracheitis, is a major cause of feline upper respiratory disease and conjunctivitis. It can present as sneezing, nasal congestion, and various other symptoms, and it can lead to chronic complications.

It primarily affects the upper respiratory tract and the eyes. The first thing owners typically notice is sneezing and watery eyes, so it is frequently mistaken for a simple cat cold or flu. It is a prevalent condition in cats that are not vaccinated and is one of the most common causes of feline upper respiratory infection.

There are a couple of important things to note:

• This is a cat-only disease - it doesn’t spread to dogs, humans, or other species.

• Herpes stays for life - this is something we will discuss in more detail later.

Feline Herpes Symptoms: From Sneezing to Serious Eye Disease

There are various clear signs of FHV-1 to look out for. Some can resemble symptoms of cat colds and flu, but you should monitor them and consider booking a vet appointment if you see any.

Respiratory signs include:

• Sneezing

• Nasal congestion

• Nasal discharge (clear and thicker)

• Coughing

• Fever

• Lethargy

• Reduced appetite

There are also eye signs to look out for, such as:

• Watery/sticky eye discharge

• Redness

• Squinting

• Swollen conjunctiva

• Sensitivity to light

Conjunctivitis tends to be the main feature - sneezing alone is usually a sign of something else. Seek urgent vet assessment if you notice your cat holding its eyes closed or visible cloudiness in the eyes. Severe redness or swelling are red flags, and things like breathing difficulty and refusing to eat need urgent attention.

Potential Eye Complications (Keratitis, Corneal Ulcers, and Scarring) — What Owners Need to Know

Feline herpes is notorious for causing complications with the eyes. Common concerns include inflammation of the cornea (keratitis) and corneal ulcers, both of which can be major risks for your cat’s eyes.

As an owner, there are things you can look for to identify ulcers. Things like frequent squinting, tearing and pawing at the eye may all indicate that your cat is struggling. If the issues is severe or keeps coming back, long-term outcomes can include:

• Scarring

• Chronic irritation

• Issues with tear film or dry eye

• Loss of vision in severe cases

A rare complication that has been seen after intense conjunctivitis is symblepharon or adhesions/scarring inside the eye structure.

If you are concerned about your cat’s eyes, always seek vet guidance. Don’t take it upon yourself to treat cat conjunctivitis with leftover eye drops as steroids can be harmful with ulcers.

How Cats Catch Feline Herpes (Contagiousness, Incubation, and Carrier State)

Feline herpes is contagious between cats. If your cat has direct contact with an infected animal;s eye, nose, or oral secretions, they can catch it. The virus can also spread through contaminated items like bowls, bedding, toys, and even hands or clothing.

Higher-risk environments for catching the virus include places where multiple cats co-exist, such as:

• Shelters

• Catteries

• Boarding

• Multi-cat households

Cats can shed the virus mainly when they are showing active signs. If your cat is exposed to the virus, it usually takes a few days before symptoms start to show.

Most infected cats become lifelong carriers of feline herpes. The virus commonly goes dormant, known as latency, but periodic flare-ups can happen and should be treated when they do.

Flare-Ups and Triggers — Why “Feline Herpes Never Leaves”

Feline herpes is not a common presence in an infected cat. Simply put, it “hides” in the cat’s nerves and reactivates later, which is when symptoms appear.

Stress is a common trigger for flare-ups. Owners often notice the virus makes an appearance in an infected cat during high-stress situations like:

• The arrival of a new pet

• Moving house

• Home renovations

• Visitors

• Boarding

Illness can also weaken the immune system and lead to flare-ups.

When the virus rears its ugly head, you will probably notice things like mild sneezing and watery eyes. Some cats may see the return of eye ulcers. You will need to treat symptoms accordingly, preferably with vet support. Things like carefully cleaning the eyes, offering hydration support, and getting treatment from a vet to help with pain are all common.

Prevent feline herpes recurrence by trying to keep stress to a minimum. Actions include:

• Sticking to a consistent routine

• Providing quiet hiding spaces

• Keeping feeding stations calm

• Using pheromone diffusers if you want to

Diagnosis, Treatment, and Prevention (What Vets Do and What Helps at Home)

When vets diagnose feline herpes, they will often start with looking at the cat’s history and performing a basic examination. The work-up usually includes eye exams, perhaps including fluorescein stain for ulcers, and swabs.

We have established that there is no cure for feline herpes. Instead, the goal is to relieve symptoms, protect the eyes, prevent secondary infection, and support healthy eating and drinking. Common supportive care measures include:

• Hydration support

• Steam or humidification

• Keeping the nose and eyes clean

• Appetite support

A vet may also prescribe some medications. These may include certain antivirals, antibiotics to treat secondary bacterial infections, and eye-specific therapies. In severe cases, hospitalisation may be necessary, or at least some nutritional support.

How To Prevent Feline Herpes in Cats

Prevention is your best defence against FHV-1. The starting point for this is usually vaccination. Though it doesn’t completely eliminate the chances of infection, it significantly reduces it. What's more, if your cat still catches the virus, the symptoms and shedding risk will be less severe.

If you have a multi-cat home, isolation is strongly recommended. Make sure each cat uses separate feeding bowls and litter. Other steps you can take to reduce the risk include:

• Regularly washing bedding

• Practicing good hand hygiene

• Reducing crowding of your cats

Look out for the symptoms as early treatment is important. If you notice your cat displaying signs of eye pain, or symptoms keep worsening and the cat displays breathing distress or loss of appetite, this is when to see a vet immediately.