Yes—cats can get herpes. In cats, “herpes” usually means feline herpesvirus type 1 (FHV-1), the virus associated with feline viral rhinotracheitis. It commonly causes sneezing, nasal congestion, and red or watery eyes. Most otherwise healthy cats recover from an uncomplicated episode, but FHV-1 remains in the body for life and can flare up again.
Arrange a veterinary examination for persistent, recurrent, or significant symptoms—especially eye problems. Treat breathing difficulty, dehydration, refusal to eat, severe lethargy, or a painful or cloudy eye as urgent. This article is general educational information, not a diagnosis or individualized treatment plan.
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What feline herpesvirus is—and why it can come back
Feline herpesvirus type 1 (FHV-1) is one of the principal causes of feline upper-respiratory disease, particularly illness affecting the nose and eyes. It is not the same virus as human herpes simplex virus, and feline herpesvirus is not known to infect people. It also is not evidence of sexual transmission or owner misconduct.
FHV-1 is extremely common. Cornell reports that as many as 97% of cats are exposed during their lifetime, and infection becomes lifelong in up to 80% of exposed cats. After the initial illness improves, the virus can remain latent—effectively dormant—in nerve tissue. Stress, another illness, or immune compromise can reactivate it, causing renewed shedding and symptoms. A cat may therefore look completely normal between flare-ups while still carrying the virus.
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Recurrent disease often appears as conjunctivitis or keratitis rather than the dramatic sneezing and congestion seen during an initial episode. Some cats also develop chronic nasal disease or secondary bacterial problems after a severe infection. FHV-1 can occur alongside feline calicivirus, Chlamydia felis, Bordetella bronchiseptica, Mycoplasma felis, or secondary bacterial infections. A cat’s symptoms should not automatically be attributed to herpes alone. [C001][C002][C008]
How cats catch it
Transmission mainly occurs through close contact with infected eye, nose, or mouth secretions. Sneezing droplets can spread the virus over short distances, and people can move respiratory secretions from one cat to another on their hands, clothing, or shared objects. Bowls, bedding, grooming tools, and other contaminated items may contribute, particularly in shelters, catteries, rescues, and multi-cat homes.
Environmental contamination is generally less important than direct or close contact, but sensible hygiene still matters. Recovered cats may continue shedding virus, and stress can trigger renewed shedding. Because cats may shed before obvious signs appear, isolation reduces risk but cannot guarantee that another cat will not become infected.
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Feline herpesvirus and feline calicivirus cannot be transmitted to humans according to current CDC guidance. Wash your hands after handling a sick cat and before touching other cats—not because you are likely to become infected, but because you may carry secretions between animals. [C002][C008][C009][C010]
Symptoms to watch for
Typical FHV-1-related signs include:
- sneezing, nasal congestion, or noisy breathing from a blocked nose;
- clear, mucoid, or thicker nasal discharge;
- watery, red, swollen, or painful eyes;
- conjunctivitis, with inflammation of the tissues around the eye;
- keratitis, or inflammation of the cornea, sometimes with a corneal ulcer;
- fever and lethargy;
- reduced appetite, often because congestion makes it harder to smell food; and
- drooling or mouth involvement, particularly when another respiratory pathogen such as calicivirus is also present.
Kittens, unvaccinated cats, and cats in crowded environments are at greater risk of clinically important disease. Many uncomplicated upper-respiratory episodes improve in roughly 7–10 days, but symptoms that persist, recur, worsen, or involve the eyes deserve veterinary attention. [C001][C002]
Eye symptoms need special attention
A red or watery eye can look minor, but FHV-1 may cause keratitis or a corneal ulcer. Ulcers can be painful and may threaten vision if they are missed or treated incorrectly. Contact a veterinarian promptly for pronounced squinting, persistent blinking, light sensitivity, rubbing at the eye, obvious pain, a cloudy or blue-looking cornea, a visible defect, or discharge that is worsening.
Do not use leftover eye medication or human eye drops. Some medications can be harmful when an ulcer is present, and an eye may need examination and specific testing before treatment is chosen.
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When to call the veterinarian—and when it is an emergency
Book a veterinary appointment for:
- persistent or recurrent sneezing;
- nasal discharge or ongoing congestion;
- redness, swelling, discharge, squinting, or pain in either eye;
- reduced appetite or unusual tiredness;
- any respiratory illness in a kitten; or
- symptoms that are not improving as expected or are getting worse.
Seek urgent veterinary care now for breathing difficulty, rapid or labored breathing, severe lethargy, dehydration, inability to keep food or water down, a cat that stops eating, pronounced eye pain, a cloudy or visibly damaged cornea, or rapidly worsening illness.
Cornell notes that lower-respiratory involvement can cause difficult or rapid breathing and that a resting respiratory rate should not exceed 35 breaths per minute. Counting breaths can provide useful information, but it should not delay care: open-mouth breathing, obvious effort, blue or gray gums, collapse, or any struggle to breathe is an emergency regardless of the number. [C001][C002]
What to do at home while arranging care
Home care can support a cat, but it cannot determine whether the cause is herpes, another infection, an ulcer, or a more serious respiratory problem.
- Keep the cat calm and warm. Stress can worsen active disease or contribute to reactivation. Provide a quiet room away from household activity and other animals.
- Clean discharge gently. Use a clean, damp cloth or a veterinarian-approved external cleaning product to soften and remove discharge from the face. Do not scrub the eye, force the eyelids open, or put unprescribed products into the eye. Cat eye wipes may be useful for external discharge when used according to their label; they are not a treatment for herpes, conjunctivitis, or a corneal ulcer.
- Make food easier to smell and eat. Offer familiar, highly palatable wet food in a calm setting. Slightly warming food can increase its aroma, but do not serve it hot. Congestion can reduce a cat’s sense of smell, and prolonged refusal to eat can quickly become a serious problem.
- Encourage hydration. Keep fresh water available and offer wet food if the cat normally eats it. Ask a veterinarian for advice if the cat is drinking very little, vomiting, or showing signs of dehydration.
- Use humidified air cautiously. Humidified air may help loosen secretions. Never expose a cat to hot steam, boiling water, or anything that could cause burns. A properly maintained humidifier used safely in the room is preferable to placing a cat near a hot shower or steam source.
Never give human cold medicines, leftover antibiotics, or unprescribed supplements. Antibiotics do not kill FHV-1, and some human medications are dangerous to cats. Even an eye product that helped a different episode may be inappropriate if the current problem includes a corneal ulcer.
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How veterinarians diagnose feline herpes
Veterinarians often make a presumptive diagnosis from the pattern of signs, the cat’s age and vaccination history, recurrence, and exposure to other cats. FHV-1 and calicivirus can be difficult to distinguish based on symptoms alone.
PCR testing or virus isolation can detect FHV-1. However, a positive PCR result does not necessarily prove that FHV-1 is the only cause of the current illness. A cat may carry or shed the virus while another pathogen, a secondary bacterial infection, an eye injury, or a noninfectious condition contributes to the signs. Test results therefore need to be interpreted alongside the examination.
For eye disease, the veterinarian may perform additional tests to look for corneal damage or ulceration. In a shelter or multi-cat outbreak, a broader respiratory pathogen panel or targeted testing may be appropriate based on the number of affected cats and the clinical pattern. [C001][C002][C003]
How feline herpes is treated
There is no medication that removes latent FHV-1 from a cat’s body. Treatment aims to suppress viral replication when necessary, control inflammation or secondary infection, protect the eyes, maintain hydration and nutrition, and keep the cat comfortable. The appropriate plan depends on age, severity, eye involvement, concurrent disease, and examination findings.
Antiviral medication
For clinically significant or recurrent disease—especially ocular disease—a veterinarian may prescribe a topical ophthalmic antiviral or oral famciclovir. Evidence summarized in veterinary literature indicates that famciclovir can reduce clinical signs and viral shedding in some cats. It is not a cure: antivirals are virostatic, meaning they suppress viral replication without eliminating latent infection.
Famciclovir dosing and formulation must be selected for the individual patient. Relevant factors include body size, age, kidney function, other illnesses, concurrent medications, and whether the cat can tolerate oral treatment. Do not use a dose found online or share medication prescribed for another cat.
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Randomized shelter studies provide supportive but not universal evidence. In one placebo-controlled study, cats receiving famciclovir had a lower risk of worsening upper-respiratory clinical scores over time; FHV-1 was detected in 11 of 21 enrolled cats. That result does not mean every feline respiratory illness will respond to famciclovir. A later prospective randomized trial examined doxycycline with or without famciclovir in kittens, reflecting the fact that respiratory disease is often multifactorial. [C004][C005][C006][C007]
Eye treatment
Eye treatment may include prescription antivirals, lubricants, or other medication selected after examination. The presence or absence of an ulcer matters: some eye medications are unsafe in an ulcerated eye. A cat that is squinting or painful should be examined rather than treated experimentally at home.
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Antibiotics do not treat the herpesvirus itself. A veterinarian may prescribe one when there is evidence or strong suspicion of a secondary bacterial infection or another bacterial respiratory pathogen. Yellow or green discharge alone does not establish that antibiotics are needed, so nasal-discharge color is not a safe basis for self-treatment. [C002]
What about L-lysine?
L-lysine has historically been marketed for feline herpesvirus, but it should not be presented as a proven treatment or routine preventive. Merck reports that some shelter studies found worse clinical disease and increased viral shedding in cats receiving oral L-lysine. Discuss any supplement with a veterinarian instead of adding it automatically. [C002][C004]
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Separating a sick cat and reducing spread
If you have multiple cats, separate the symptomatic cat as much as practical, particularly during active sneezing, nasal discharge, or conjunctivitis. Use separate bowls, litter equipment where feasible, bedding, and grooming tools. Wash your hands after handling the sick cat and before touching the others. Clean visible secretions from surfaces and launder bedding regularly.
For an isolation room, washable cat bedding can make routine laundering easier. This is an infection-control convenience, not a treatment and not a guarantee against transmission. Choose bedding that can be washed regularly, keep it separate from the other cats’ items, and follow the veterinarian’s advice if several cats become ill.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteIsolation may be difficult in a small home, and it cannot undo exposures that occurred before symptoms appeared. Nevertheless, reducing close contact and sharing of contaminated items is especially worthwhile in homes with kittens, elderly cats, unvaccinated cats, or cats with weakened immune systems. [C002][C008]
Vaccination: useful, but not a guarantee
FHV-1 protection is part of the core feline vaccination approach in the 2020 AAHA/AAFP guidelines, generally given in combination with protection against feline calicivirus and feline panleukopenia. Vaccination does not reliably prevent every infection and does not eliminate latent virus. Its principal benefits are reducing disease severity and shedding.
The schedule should be selected with a veterinarian based on the cat’s age, previous vaccines, health, lifestyle, and exposure risk. A vaccinated cat can still develop respiratory signs, but vaccination remains an important way to reduce the risk of severe disease at the individual and population level. [C011][C012]
Prognosis and long-term management
Many otherwise healthy cats recover from an uncomplicated episode. The long-term outlook is less predictable when a kitten is severely ill, appetite and hydration are poor, the cornea is involved, lower-respiratory signs develop, or another infection is present.
Because FHV-1 remains latent, some cats have intermittent conjunctivitis or keratitis for life. Others develop chronic rhinitis or recurrent secondary bacterial problems. Keeping a record of flare-ups, stressors, appetite, eye changes, and treatments can help a veterinarian identify patterns and create a plan for recurrent disease. Seek care early for future eye symptoms rather than waiting for them to become severe.
Common misconceptions
- “Herpes means my cat has a sexually transmitted infection.” No. Feline herpesvirus is a common respiratory and ocular virus spread mainly through infected secretions and close contact.
- “My cat looks healthy, so it cannot have herpes.” A cat can look normal between episodes while harboring latent virus.
- “A positive PCR proves herpes is causing everything.” No. PCR findings require clinical interpretation, and other pathogens or conditions may be involved.
- “L-lysine will reliably cure or prevent it.” Evidence does not support that assumption, and some studies raised concerns about worse disease or increased shedding.
- “Antibiotics cure feline herpes.” No. They may be appropriate for a secondary bacterial infection or another bacterial pathogen, but they do not kill FHV-1.
- “It cannot affect people, so hygiene does not matter.” People are not the usual victims of FHV-1, but hands and clothing can carry secretions from one cat to another.
Frequently Asked Questions
Can feline herpes be cured?
There is no treatment that removes latent FHV-1 from a cat’s body. Veterinary treatment can suppress active viral replication, protect the eyes, address secondary infections, and relieve symptoms. Many cats live normally between occasional flare-ups.
Is feline herpes contagious to other cats?
Yes. It spreads mainly through infected eye, nose, and oral secretions and close contact. Separate a symptomatic cat as much as practical, use separate supplies, and wash your hands between cats.
Can humans catch herpes from cats?
Feline herpesvirus type 1 is not the same as human herpes simplex virus, and current CDC guidance states that feline herpesvirus cannot be transmitted to humans. People can still transfer respiratory secretions between cats on their hands or clothing.
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Do not assume L-lysine will prevent or treat feline herpes. Veterinary evidence does not support routine use, and some shelter studies reported worse disease and increased viral shedding. Ask your veterinarian before giving it.
How long does feline herpes last?
Many uncomplicated upper-respiratory episodes improve in about 7–10 days, but eye disease or other complications may last longer. Because the virus remains latent, symptoms can recur later, especially after stress or illness.
The Bottom Line
The practical answer: feline herpes is common, usually manageable, and not contagious to people—but it can seriously affect a cat’s eyes and breathing. Arrange veterinary care for persistent or recurrent signs, get prompt examination for eye symptoms, and seek emergency help for breathing difficulty, dehydration, refusal to eat, severe lethargy, or a painful or cloudy cornea. Supportive care and hygiene can help while you arrange care, but prescription treatment must be tailored to the individual cat.
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