🗺️🐈 H5N1 Cat Flu Outbreak 2026: Which U.S. States Have the Highest Risk? Vet Warnings, Symptoms and What to Do
The H5N1 avian influenza outbreak in the United States is not confined to farms or wild birds. USDA APHIS has confirmed H5N1 in domestic cats across at least 18 states, and veterinarians from the AVMA, FeVMA, Johns Hopkins, and the University of Maryland are issuing increasingly urgent guidance for American cat owners. This article uses the latest USDA APHIS data, CDC reports, and state health department findings to map which states carry the highest risk, what symptoms you need to recognize, and exactly what your veterinarian wants you to do right now.
📊 By the Numbers: U.S. Feline H5N1 Outbreak (March 2026)
130+ confirmed domestic cat cases since December 2022, across 18 states (USDA APHIS NVSL data).
97 tracked cases since 2023: California (20), Oregon (14), Colorado (9), South Dakota (9), then Washington, Minnesota, Kansas, Iowa, Louisiana, New Jersey, Arizona and others.
50–70% fatality rate in cats confirmed infected with the current H5N1 strain (AVMA, CDC). Many cases are not diagnosed until after death.
H5N1 is endemic in wild birds in all 50 states per the CDC as of 2026. Risk is elevated everywhere; it is highest where dairy cattle outbreaks, poultry operations, and raw pet food distribution overlap.
Dairy cattle outbreaks confirmed in 19 states: AZ, CA, CO, ID, IA, KS, MI, MN, NE, NV, NM, NC, OH, OK, SD, TX, UT, WI, WY.
🗺️ State Risk Breakdown: The Full Picture
Risk for cats in any given state is determined by three overlapping factors: (1) documented H5N1 in domestic cats, (2) H5N1 confirmed in nearby dairy cattle herds, and (3) geographic density of infected wild bird populations — particularly waterfowl migration corridors. The following deep-dive covers the states with the most activity.
🔴 California — Highest Confirmed Feline Case Count in the U.S.
California leads the country with more than 20 confirmed domestic cat H5N1 cases. Los Angeles County alone has documented multiple clusters, including cats in Los Angeles, Fresno, San Mateo, and San Diego counties. The state also leads national dairy cattle totals — with over 700 confirmed herd detections representing the majority of the national total. The Los Angeles County Department of Public Health issued an explicit advisory against feeding pets raw food following the Northwest Naturals recall and subsequent cases. Cats in California have been infected through raw food, raw milk, and direct contact with infected wild birds and poultry environments.
🔴 Oregon — The Epicenter of Raw Food Transmission
Oregon has 14+ confirmed feline cases and is the state where the connection between contaminated commercial raw pet food and confirmed cat H5N1 death was first definitively proven. The Oregon Department of Agriculture confirmed an indoor-only Washington County cat died after eating Northwest Naturals brand raw turkey food, with genomic sequencing proving a direct match. A second Oregon cat in Multnomah County was confirmed positive in February 2025. Multiple Oregon Veterinary Medical Association alerts have been issued. Oregon has also reported H5N1 in backyard poultry, dairy farms, and multiple wild bird species, creating overlapping risk factors for any outdoor or raw-feeding cat in the state.
🔴 Colorado — Indoor Cat Risk from Fomites and Raw Food
Colorado has 9+ confirmed cases, including the situation that triggered the most significant CDC reporting update of the outbreak. Two strictly indoor cats in Colorado — with no known exposure to infected livestock, wild birds, or raw food — tested positive for H5N1. Both lived with dairy farm workers. The CDC published findings in its Morbidity and Mortality Weekly Report (MMWR) flagging contaminated clothing, shoes, and other fomites as a possible transmission route from humans to household cats. This was the first documented evidence in the U.S. of possible human-to-cat transmission. Additionally, Colorado cats were linked to the Savage Cat Food cluster. The state also has confirmed dairy cattle outbreaks.
🔴 Washington — Wildlife Contact and Sanctuary Outbreak
Washington state has a complex exposure profile. The Washington State Department of Agriculture confirmed an outdoor cat in Grant County died in January 2026 after contact with infected wild waterfowl — the state’s first wildlife-linked domestic cat death of 2026. Separately, 20 big cats at the Wild Felid Advocacy Center of Washington (Mason County) died after contracting H5N1 from wild birds entering their enclosures. Washington also led all states in human H5N1 poultry worker cases, with 11 confirmed infections. The Northwest Naturals recall product was also distributed in Washington state.
🟠 South Dakota, Minnesota, Iowa, Kansas, Louisiana — Farm Belt Exposure
South Dakota ranks fourth nationally in confirmed feline cases with 9+. The state has significant poultry industry infrastructure and is a major flyway for migratory waterfowl. Minnesota has confirmed feline cases including a Morrison County house cat. Iowa, Kansas, and Louisiana have each had confirmed feline cases — all three states have confirmed dairy cattle H5N1 outbreaks. Louisiana was also the site of the first U.S. H5N1 human death in January 2025, in a patient with backyard poultry exposure.
🟠 Arizona — New Genotype Concern
Arizona has seen 12 feline cases as of September 2025 reporting, and is notable for a different reason: the USDA confirmed a second H5N1 genotype — D1.1 — in Arizona dairy cattle, in addition to the B3.13 genotype circulating in most other states. The D1.1 genotype has been associated with PB2 mutations linked to improved replication in mammalian cells, per AVMA analysis. While no evidence of person-to-person transmission has been found, virologists note this genotype warrants close monitoring.
🟠 New Jersey — Unexplained Cluster Raises Cat-to-Cat Questions
In late February 2025, New Jersey reported a cluster of six cats on a single property that became ill. One feral cat was confirmed H5N1-positive and euthanized due to severe illness. Notably, none of the six cats had known exposure to infected livestock or had eaten raw or unpasteurized food products. Public health officials believe the cats may have encountered infected wild birds outdoors. The USDA notes that while cats are generally considered dead-end hosts with limited transmission to other cats, the New Jersey cluster raised the possibility of cat-to-cat spread among animals in close proximity.
🚨 The Three Risk Factors That Drive Your Cat’s Personal Risk Level
🔴 Tier 1: Maximum Risk
Raw or freeze-dried poultry-based diet + outdoor access in CA, OR, CO, WA, SD or AZ + farm worker in household
🟠 Tier 2: High Risk
Any one of: raw food, outdoor access in high-risk states, farm-adjacent location, or household member working near poultry/dairy
🟡 Tier 3: Moderate Risk
Indoor-only, no raw food, but in a state with confirmed H5N1 in dairy cattle or wild birds with some outdoor exposure (screened porch, catio)
🟢 Tier 4: Lower Risk
Strictly indoor, cooked commercial food only, no farm-worker household contact, no dairy or poultry proximity
🏥 What Veterinarians Are Saying: Direct Quotes from U.S. Authorities
“Cats are very susceptible to severe illness, possibly resulting in death, from the H5N1 virus.”— Dr. Ashlie Saffire, President, Feline Veterinary Medical Association (FeVMA)
“Around 130 cases of highly pathogenic avian influenza type A (H5N1) have been confirmed in domestic cats, which are ‘exquisitely sensitive’ to the virus.”— Dr. Meghan Davis, Associate Professor, Johns Hopkins Bloomberg School of Public Health, cited in AVMA reporting
“So far, 43 types of mammals have tested positive for bird flu in the U.S., with domestic cats being the highest number. And with a respiratory virus like influenza, having a large reservoir of infected cats could be really dangerous.”— Dr. Leyi Wang, Clinical Associate Professor, University of Illinois College of Veterinary Medicine
“The virus has evolved, and the way that it jumps between species — from birds to cats, and now between cows and cats, cats and humans — is very concerning.”— Dr. Kristen Coleman, PhD, University of Maryland School of Public Health (lead author, systematic H5N1 feline review)
“We estimate that this phenomenon is underreported in the scientific literature and argue that increased surveillance among domestic cats is urgently needed.”— University of Maryland UMSPH systematic review of 41 studies, published CIDRAP/UMDSPH 2025
🚨 Recognize the Symptoms: What H5N1 Looks Like in Cats
H5N1 in cats is particularly dangerous because it can progress from first symptom to death in under 24 hours. The FDA stated it “can cause subtle initial symptoms but progress rapidly, often resulting in death within 24 hours.” Knowing early signs is critical.
| Symptom | System Affected | What to Do |
|---|---|---|
| Sudden lethargy, won’t move | General | Call vet now — mention H5N1 exposure history |
| Loss of appetite | General | Call vet; monitor for additional signs |
| Coughing, sneezing | Respiratory (early) | Call vet; note exposure factors |
| Nasal or eye discharge | Respiratory | Call vet; isolate from other pets |
| Difficulty breathing, open-mouth breathing | Respiratory (severe) | Emergency vet immediately |
| Disorientation, unsteady walking | Neurological onset | Emergency vet immediately |
| Head tilt, circling | Neurological | Emergency vet immediately |
| Seizures, tremors, paralysis | Neurological (advanced) | Emergency vet immediately |
| Sudden death, no prior signs | Any system | Contact vet for post-mortem testing if H5N1 exposure suspected |
✅ What to Do: Your State-Specific Action Plan
📋 All U.S. Cat Owners — Do These Now
- Stop feeding raw or freeze-dried poultry-based food — Switch to commercially cooked food until the outbreak is controlled. AVMA, FDA, and USDA all recommend this now.
- Check the FDA Recalls & Withdrawals database at fda.gov/animal-veterinary/safety-health/recalls-withdrawals — Bookmark it. Check before every raw food purchase.
- No unpasteurized milk or colostrum for cats — Dairy cattle H5N1 is confirmed in 19 states; raw milk is a proven feline transmission route.
- Know the symptoms and your vet’s after-hours protocol — H5N1 can kill within 24 hours; evening and weekend symptoms cannot wait until Monday morning.
📋 If You’re in a High-Risk State (CA, OR, CO, WA, SD, AZ, MN)
- Keep cats indoors — H5N1 is circulating in wild birds in these states continuously. Outdoor and hunting cats face direct exposure risk.
- Implement a shoe-change or disinfect protocol at the door — especially if you visit farms, feed stores, or walk in areas with waterfowl.
- Ask your vet about H5N1 surveillance protocols — In Oregon, veterinarians are required to immediately report suspected HPAI cases. Know your state’s reporting process.
- Monitor the USDA APHIS HPAI page at usda.gov and your state’s department of agriculture for new county-level detections near you.
📋 If Your Cat Has Possible Exposure and Develops Symptoms
- Isolate the cat immediately from all other pets and minimize close human contact.
- Call your veterinarian — do not walk in without calling first. Describe the potential H5N1 exposure and current symptoms.
- Wear gloves when handling a sick cat if H5N1 is suspected. The CDC recommends PPE for unprotected close contact.
- Monitor household members for flu-like symptoms for 10 days. If anyone develops fever, cough, or respiratory symptoms, contact your doctor and mention the cat’s illness.
- If the cat dies: Contact your vet about post-mortem H5N1 testing. Report suspected cases to your state veterinarian.
❓ What Veterinarians Are Being Asked Right Now
❓ My vet says not to panic. But this sounds serious. Which is it?
Both are true simultaneously. The overall risk to any individual cat in the United States remains low on a population level. But H5N1 kills the majority of cats it infects, and exposure routes — raw food, wild birds, farm contacts — are not rare or unusual. Your vet is correct that routine panic is unwarranted. Taking targeted, practical steps (no raw food, indoor access, shoe hygiene) is the proportionate response. The CDC’s official position is that the current overall public health risk is low — but specifically for cats, the AVMA describes them as exquisitely sensitive to this particular strain.
❓ Should I test my cat for H5N1 proactively?
Routine proactive testing is not currently recommended by the AVMA or CDC for asymptomatic cats with no known exposure. Testing is recommended when a cat shows compatible symptoms and has a documented risk factor. If your cat hunts regularly or is fed raw food in a high-risk state, discuss the situation with your vet — they can advise based on current local conditions. Note that in most states, H5N1 testing in animals is coordinated through the state veterinarian’s office.
❓ Is the risk higher for specific cat breeds?
No breed-specific H5N1 susceptibility differences have been documented. Age may play a role — older cats and those with underlying respiratory conditions may be more vulnerable to severe illness. But the AVMA notes that healthy adult cats have died from H5N1, and the high fatality rate appears consistent across the confirmed cases documented in the U.S.
❓ What is the CDC doing about cats specifically?
The CDC updated its guidance page on managing cats exposed to H5N1 (cdc.gov/bird-flu) and its MMWR published the indoor-only cat cases in Colorado. The USDA APHIS NVSL continues tracking all confirmed feline cases nationally. However, veterinary epidemiologists at University of Maryland and Johns Hopkins have specifically called out the lack of systematic feline surveillance as a major gap — the true number of H5N1-infected cats is believed to be significantly higher than confirmed case counts.
❓ If H5N1 is endemic in wild birds in all 50 states, does that mean every outdoor cat is at risk?
Endemic in wild birds means the virus is continuously circulating, not that every bird is infected. Outdoor cats face ongoing exposure risk from hunting and scavenging sick birds, but most bird encounters do not involve an H5N1-positive bird. The risk is meaningful and real — it is why the AVMA and CDC recommend keeping cats indoors during this outbreak — but it is a probability calculation, not a certainty.
📱 Track Your Cat’s Health, Location Exposure and Diet with Patify
State Outbreak Alerts · Symptom Log · Food Brand Tracker
Log your cat’s daily health, track which food brands and batches they’ve eaten, and keep a record of any outdoor exposure. If a recall or outbreak hits your county — you’ll know exactly what your cat ate and when.
Download Patify Free🎯 The Bottom Line
H5N1 is a real, documented threat to domestic cats in the United States in 2026. The risk is not equal across all states, all cats, or all feeding practices — but it is not theoretical.
California, Oregon, Colorado, Washington, South Dakota and Arizona are the states with the most confirmed cases. Outdoor access and raw poultry-based food are the highest-risk factors you can control. Indoor cats are not immune, but their risk is substantially lower. The steps veterinarians are recommending are practical, low-cost, and effective when applied consistently.
Know your state. Manage the risks you can control. Talk to your vet. 🐈🗺️
