A cat died in a Los Angeles home last winter. Then another. Then more, until 14 cats across five households were dead or euthanized, and a veterinary professional who’d been caring for sick cats without full protective gear quietly became the first human in history confirmed to have caught H5N1 bird flu from a domestic cat. That case, documented in a CDC MMWR report published May 7, 2026, changed the conversation around this virus permanently. If you own a cat, especially one that eats raw food or goes outside, this summer is the time to pay attention.

The details matter here. The LA cluster involved 19 cats across five households who got sick between November 2024 and January 2025. The common thread: commercially purchased raw animal products. Nine of those cats tested positive for H5N1. Fourteen died or were euthanized. Of 25 people who’d been exposed to infected cats and agreed to antibody testing, one came back positive. That person, a veterinary professional, had performed high-exposure procedures including intubation, surgery assistance, and CPR on sick cats, wearing only gloves. No respiratory protection. No face shield. They never developed symptoms, but the serologic evidence was clear. Cat-to-human transmission had happened.

The AVMA has been tracking H5N1 in cats across 18 countries, and the fatality picture is grim: over half of infected cats have died from the virus. There’s no available vaccine for cats. This isn’t a distant agricultural problem anymore. It arrived in people’s living rooms.

Key takeaways
  • The first confirmed cat-to-human H5N1 transmission was documented by the CDC on May 7, 2026, in Los Angeles.
  • 14 of 19 exposed cats in the LA cluster died; all had eaten commercially purchased raw animal products.
  • Only 1 of 25 exposed humans tested positive, but that person performed unprotected high-exposure procedures.
  • H5N1 has been confirmed in cats across 18 countries; over half of infected cats have died.
  • No H5N1 vaccine is currently available for domestic cats.

What Actually Happened in Los Angeles, and Why It’s a First

Before this report, we knew cats could get H5N1. We’d seen it in farm cats exposed to infected dairy herds, in big cats at zoos, in strays near poultry operations. What we hadn’t confirmed, with serologic evidence in a peer-reviewed CDC report, was a domestic cat passing the virus to a human in a household or clinical context. That’s what the May 7 MMWR established.

The infected vet professional was asymptomatic, which is important for two reasons. First, it means human infection doesn’t guarantee you’ll feel sick, which makes casual dismissal of exposure events genuinely risky. Second, it means surveillance based only on sick people will miss cases. The Worms & Germs Blog, which covers zoonotic disease and is written by veterinary infectious disease specialists, flagged this case immediately on May 7 and noted that the asymptomatic presentation suggests we’re probably undercounting human H5N1 infections overall.

The procedures this person performed, intubation and CPR especially, generate aerosols. That’s a very different exposure than petting a sick cat. Most cat owners aren’t intubating their pets. But the case still matters to you because it proved the transmission pathway exists, and it tells us something about which exposures carry more risk.

The Raw Food Connection Is Real and Direct

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I’ve had this conversation with clients more times than I can count over the past year and a half. Someone comes in with a sick cat and mentions they feed raw. I’m not here to debate the raw feeding community, but the LA cluster should settle at least one question: contaminated raw pet food is a real, documented route for H5N1 to reach your cat.

The five LA households had one thing in common. Not backyard chickens. Not proximity to a farm. Commercially purchased raw animal products. The AVMA’s ongoing guidance on H5N1 in cats lists the key exposure routes clearly:

Exposure RouteRisk LevelNotes
Raw or undercooked meatHighDocumented in LA cluster; direct source of virus
Unpasteurized milkHighKnown H5N1 transmission route
Contaminated raw pet foodHighSource in May 2026 LA cluster
Outdoor contact with wild birdsModerate-HighEspecially waterfowl; varies by region
Contact with infected poultryModerate-HighHigher risk near farms or live markets
Contact with other infected catsUnder investigationCat-to-cat transmission not fully characterized

If your cat eats raw food, this is the moment to either switch to a commercially cooked diet or, at minimum, source from a supplier that tests for avian influenza. That testing exists. Not all brands do it. Ask directly before you buy.

What Sick Looks Like, and When to Call Your Vet

H5N1 in cats doesn’t look like a standard upper respiratory infection. What I’ve read in case reports and what came out of the 2026 AVMA Convention panel (held July 10 to 14 in Anaheim, where H5N1 in cats had its own dedicated session) is that neurological signs are common and can be alarming: seizures, loss of coordination, extreme lethargy. Respiratory signs including labored breathing, open-mouth breathing, and discharge also appear. High fever. Rapid deterioration.

This is not a “wait and see over the weekend” situation. If your cat is showing neurological symptoms or struggling to breathe, that’s same-day emergency care. If your cat ate raw food and develops a fever and is suddenly lethargic, call your vet that day and mention the raw food history and the H5N1 risk. Your vet needs that context to make the right call on testing and isolation.

When you call or go in, wear a mask. I know that sounds like overkill for a vet visit. It isn’t. A cat sick with H5N1 is shedding virus, and the LA case proved that close contact with an infected cat carries transmission risk. You’re not performing CPR on your cat, but you are handling an animal that may be highly contagious. Protect yourself and tell the clinic what you suspect before you walk in so they can prepare appropriately.

What You Can Actually Control Right Now

Outdoor cats that hunt birds or rodents are at real risk, especially this summer as wild bird H5N1 continues circulating. Keeping your cat indoors eliminates that exposure route entirely. I know that’s not the right choice for every cat or every household, but it’s the most direct protective measure available given that there’s no vaccine.

Beyond that, the list is short and practical. Stop raw feeding, or at minimum switch to high-pressure processed (HPP) raw from a brand that tests for avian influenza. Never give your cat unpasteurized milk or raw poultry scraps from your kitchen. If you live near a farm, a live poultry market, or an area with reported wild bird die-offs, treat your cat as higher risk and talk to your vet about it now rather than after a sick bird shows up in your yard.

If you work in veterinary medicine and you’re still doing aerosol-generating procedures on cats without respiratory PPE, the LA case is your sign to change that protocol immediately. Gloves alone were not enough.

The honest reality is that H5N1 in cats is still a relatively rare event for most households. But it spread across 18 countries, it killed the majority of cats it infected, and it just crossed into a human for the first time through a domestic cat. The things that protect your cat from it cost nothing except a change in routine. That’s a trade worth making.

Sources

Photo: Anatolii Maks via Pexels

This article is for general informational purposes only and does not constitute veterinary advice. Pet health symptoms can have many causes and require professional evaluation. Always consult a licensed veterinarian for diagnosis and treatment specific to your pet.

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