What are the chances of getting bird flu: realistic risks & prevention

For most people, the chance of getting bird flu is extremely low. As of May 2026, the WHO has recorded just 1,000 laboratory-confirmed human cases of H5N1 globally since 2003, roughly 43 cases per year across the entire planet. The people who have been infected were almost always in direct, close contact with infected birds or contaminated environments. If you do not work on a poultry farm, handle live or dead birds, or have close contact with infected animals, your personal risk right now is negligible. That said, risk is not zero for everyone, and certain exposures change that picture significantly.

Quick take: How likely are you to get bird flu?

The current WHO and FAO/WOAH joint assessments are consistent and clear: human infections with avian influenza A(H5) viruses remain rare, and sustained human-to-human transmission has not been documented. What does drive risk is direct animal exposure. A 2006 case-control study from Vietnam found that people who handled sick or dead poultry in the week before illness had roughly nine times the odds of H5N1 infection compared to those who had not. That one statistic captures the pattern you see across decades of outbreak data: bird flu is primarily an occupational and contact-based hazard, not a community-spread illness.

What is bird flu in humans?

Avian influenza (bird flu) refers to influenza A viruses that primarily circulate in birds but can, under the right exposure conditions, infect humans and other mammals. The strains you hear most about are classified by their surface proteins: hemagglutinin (H) and neuraminidase (N). H5N1 is the subtype with the longest track record of serious human illness. It belongs to a group called Highly Pathogenic Avian Influenza (HPAI) viruses, meaning they cause severe disease in poultry. Since 2021, the dominant global strain has been H5N1 clade 2.3.4.4b, which has spread across wild bird populations on every continent and spilled over into mammals including dairy cattle in the United States. For a concise overview of how these viruses affect people, see what is bird flu in humans.

Other subtypes matter too. H7N9 caused hundreds of human cases in China between 2013 and 2017, predominantly in people exposed to live poultry markets. H9N2 circulates widely in poultry across Asia and the Middle East and has caused occasional, generally mild human infections. H5N2 and H5N8 have primarily been animal health concerns with very rare human detections. The WHO tracks all of these, but H5N1 clade 2.3.4.4b is the one driving most current concern because of its geographic breadth and its demonstrated ability to infect mammals.

How avian influenza spreads

Bird-to-bird transmission

Among birds, HPAI spreads rapidly through respiratory secretions and feces. Wild migratory waterfowl, especially ducks and geese, often carry the virus without obvious illness but shed it in huge quantities. When wild birds come into contact with commercial or backyard flocks, through shared water sources, contaminated feed, or even just proximity, the virus can jump into the domestic population with devastating speed. The WOAH/FAO global surveillance system has documented thousands of outbreaks across wild and domestic bird populations from 2021 to 2026, with tens to hundreds of millions of poultry lost or culled during this period.

Bird-to-human transmission

The main route into humans is direct contact: touching infected birds (alive or dead), handling their feces or feathers, or working in environments heavily contaminated with virus. Aerosol generation during slaughter and defeathering is particularly high-risk because it puts concentrated virus particles near the face. Environmental persistence is also a factor: avian influenza virus can survive in feces and cool water for days to several weeks, potentially up to around 35 days in feces kept at below 4 degrees Celsius. That means a contaminated barn or waterway can remain hazardous well after the visible outbreak has passed.

Human-to-human transmission

This is the critical question from a pandemic-preparedness standpoint, and the current answer is reassuring. Sustained human-to-human transmission of contemporary H5 viruses has not been documented. There have been a small number of household cluster investigations where limited, non-sustained transmission between people appeared to occur, but these clusters have always burned out on their own. Scientists do monitor for mammalian-adaptation markers in the virus, particularly substitutions in the PB2 gene (positions 627K, 701N, 591K) that are associated with better replication in mammalian tissues. These markers have appeared sporadically in animal and occasional human isolates of clade 2.3.4.4b, but as of mid-2026 they have not led to any documented sustained person-to-person spread.

How common is bird flu globally and in the U.S.?

In animals, bird flu is not rare at all right now. For a focused overview of human case counts and personal risk, see the explainer titled how common is bird flu in humans. The current clade 2.3.4.4b panzootic (a pandemic affecting animals across multiple continents) is the most geographically widespread HPAI outbreak in recorded history. WOAH's animal health information system (WAHIS) and FAO's EMPRES global animal disease monitoring system document ongoing outbreaks across wild and domestic bird populations in the Americas, Europe, Africa, Asia, and most recently Australia, which notified WOAH of its first wild bird H5N1 case in June 2026. For more detail, see how common is bird flu.

In humans, the numbers look very different. One thousand confirmed human H5N1 cases across 23 years (2003 to 2026) is an extraordinarily small number given that billions of people share a planet with infected bird populations. In the United States during 2024 and 2025, a wave of H5N1 in dairy cattle and poultry led to dozens of human detections, mostly among farm and poultry workers. A NEJM clinical and genomic report (Highly Pathogenic Avian Influenza A(H5N1) Virus Infections in Humans, 2025) found most U.S. human H5N1 infections in 2024–2025 were occupational, linked to farm/poultry/cattle exposure, often mild or asymptomatic, and caused by clade 2.3.4.4b viruses Highly Pathogenic Avian Influenza A(H5N1) Virus Infections in Humans (NEJM clinical/genomic report, 2025). Most cases were mild or had only conjunctivitis (eye inflammation). CDC serosurveys of occupationally exposed workers during the 2024 U.S. response found very low or no detectable neutralizing antibodies in tested subsets, which is consistent with a pattern of genuine rarity even among exposed populations.

How common is bird flu in specific species?

Poultry and wild birds

HPAI H5N1 is now effectively endemic in wild bird populations across large parts of the world. For commercial and backyard poultry, it is a catastrophic disease when it arrives: flocks can collapse within days, and culling to prevent further spread means losses of millions of birds per outbreak event. The scale of this animal epidemic is genuinely large, even though it rarely crosses into humans.

Dogs

Confirmed H5N1 infections in domestic dogs have been documented, typically in dogs that consumed infected poultry carcasses or had close contact with infected birds or raw poultry products. Dogs appear less susceptible than cats, and documented canine cases with severe outcomes have been rarer. The risk to dogs is real but relatively low under normal household conditions. For more on canine cases, documented exposures, and practical risk guidance, see the section on how common is bird flu in dogs.

Pigeons

Pigeons have historically shown lower susceptibility to HPAI H5N1 compared to ducks, geese, and chickens. While they can become infected, they typically shed less virus and become less severely ill than other bird species. Surveillance detections in pigeons exist, but pigeons have not been identified as a major amplifying host for current clade 2.3.4.4b strains. That said, direct contact with any wild bird population carries a degree of exposure risk, particularly in areas with active outbreaks.

What bird flu looks like in humans

The incubation period, meaning the time from exposure to first symptoms, is typically 2 to 5 days, though some case series have reported periods up to about 10 days. The range of illness is wide. In recent U.S. farm-worker cases, many infections caused only conjunctivitis (red, watery eyes) or mild respiratory symptoms, and some people appeared to have been infected without noticing anything at all. At the other end of the spectrum, historical H5N1 cases (particularly from Southeast Asia and the Middle East) have involved severe viral pneumonia, respiratory failure, and multi-organ dysfunction, with median time from symptom onset to death of roughly 9 to 11 days in the most severe historical series.

• Conjunctivitis (eye redness, watering, discharge): common in recent U.S. occupational cases
• Fever, often high (above 38°C / 100.4°F)
• Cough, sore throat, runny nose
• Muscle aches and fatigue
• In severe cases: rapidly progressing pneumonia, difficulty breathing, low blood oxygen
• Gastrointestinal symptoms (nausea, vomiting, diarrhea) reported in some patients
• In the most severe cases: multi-organ failure, septic shock

If you have had direct contact with sick or dead birds or infected animals and develop fever, eye symptoms, or respiratory illness within 10 days, you should contact your doctor and mention your exposure history. Early treatment with antivirals (oseltamivir, brand name Tamiflu) is recommended and is more effective when started promptly.

What bird flu looks like in birds, dogs, and pigeons

Signs in birds

HPAI in poultry can kill birds so quickly that the first sign you notice is sudden, unexplained death with no prior warning. For photos and a detailed list of clinical signs, see our section on what does bird flu look like in birds. When illness is visible before death, it often includes swollen head, face, and wattles, blue-purple discoloration of the comb and wattles (cyanosis), discharge from eyes and nostrils, difficulty breathing and abnormal sounds, diarrhea, and neurological signs such as loss of coordination, tremors, or torticollis (twisted neck). Egg production in laying flocks can drop sharply or stop entirely. Wild birds, by contrast, may show milder signs or none at all before dying, which is part of why they are such effective long-distance carriers.

Signs in dogs

In dogs, H5N1 infection has been associated with fever, lethargy, loss of appetite, respiratory signs (coughing, nasal discharge), and in some severe veterinary cases, neurological signs and death. Because dogs may not show dramatic early symptoms, any dog that has consumed raw poultry or wildlife carcasses in an area with active HPAI detections and then becomes unwell should prompt a call to a veterinarian.

Signs in pigeons

When pigeons do become ill with HPAI, signs can include ruffled feathers, lethargy, neurological symptoms (head tilt, circling, uncoordinated movement), and respiratory distress. Because pigeons tend to be more resistant than chickens or turkeys, clinical illness in a pigeon in a mixed-species setting can actually be a relatively late indicator that a serious outbreak is underway in more susceptible species nearby. For more detail on clinical signs and how to recognize infection, see our short guide on what does bird flu look like in pigeons.

Who is most at risk and how to estimate your personal risk

Your personal risk of getting bird flu comes down to three things: how close you get to infected animals or contaminated environments, how frequently you have that exposure, and what protective measures you use. The general public going about daily life, including eating cooked poultry and eggs, attending markets, or being outdoors near birds, faces negligible risk. The virus does not spread through the air over long distances, and it is killed by thorough cooking (internal temperature of 74°C / 165°F).

General public

Do not touch sick or dead wild birds with bare hands. If you find a dead bird, particularly a waterfowl or raptor, in an area with known HPAI activity, report it to local wildlife authorities rather than handling it yourself. Wash hands after any outdoor contact with bird environments.

Farmers and backyard poultry keepers

Biosecurity is the single most effective tool available to you. Keeping wild birds out of your flocks, using dedicated footwear and clothing for the poultry area, and not moving birds or equipment between farms without proper cleaning are the pillars of outbreak prevention. If you notice sudden deaths or the signs described above, isolate affected birds immediately, stop all movement on and off the property, and notify your state or national animal health authority. Personal protective equipment (PPE) when handling sick or potentially infected birds should include gloves, a well-fitting face mask (N95 or equivalent), and eye protection.

Abattoir and live-market workers

The slaughter and defeathering process generates aerosols that significantly raise inhalation exposure. Consistent use of respiratory protection and eye protection in these settings is not optional, it is the difference between a manageable occupational risk and a serious one. Facilities should have surveillance plans that allow for rapid testing of workers who develop symptoms, and workers should feel empowered to report illness without fear of consequences.

Pet owners and veterinary professionals

A 2026 MMWR report documented serologic evidence of H5N1 infection in a veterinary professional in Los Angeles County who had occupational exposure to an H5N1-infected domestic cat. CDC MMWR (May 7, 2026) reports serologic evidence of H5N1 infection in an asymptomatic veterinary professional after occupational exposure to an H5N1‑infected domestic cat in Los Angeles County CDC MMWR (May 7, 2026) reports serologic evidence of H5N1 infection in an asymptomatic veterinary professional after occupational exposure to an H5N1‑infected domestic cat in Los Angeles County.. This is the kind of data point that should raise awareness, not panic. The risk to a typical pet owner whose cat has no known HPAI exposure is vanishingly small. The risk changes if your cat is an outdoor hunter in an area with active wild bird HPAI detections, or if a dog has been eating raw wildlife or poultry. In those situations, limiting your cat's outdoor access during active local outbreaks and keeping dogs away from dead birds and raw poultry scraps are practical steps worth taking.

Practical steps to reduce your risk

1. Avoid touching sick or dead birds (wild or domestic) with bare hands. Use gloves and wash hands thoroughly afterward.
2. Cook poultry and eggs to an internal temperature of at least 74°C (165°F). Properly cooked poultry and eggs are safe to eat.
3. If you work with poultry or on a farm during an active outbreak, use PPE: gloves, N95 or equivalent mask, and eye protection (goggles or face shield).
4. Keep wild birds away from domestic flocks using physical barriers, covered runs, and by eliminating shared water and feed sources.
5. Do not let cats roam freely outdoors in areas with confirmed HPAI wild bird detections. Keep dogs away from dead birds and wildlife carcasses.
6. If you develop fever, eye symptoms, or respiratory illness within 10 days of contact with potentially infected birds or animals, call your doctor and tell them about your exposure.
7. Check current outbreak status through your national animal and public health authorities (CDC in the U.S., ECDC in Europe, WOAH's WAHIS for global animal data, and WHO for human case counts).
8. Seasonal influenza vaccination does not protect against avian influenza, but it reduces the chance that avian and human influenza viruses can mix in the same person, which matters from a pandemic-preparedness standpoint.

Testing, treatment, and vaccines: what is actually available

If you have had a high-risk exposure and develop symptoms, testing is done via PCR on a respiratory swab (or eye swab if conjunctivitis is the main symptom). Antiviral treatment with oseltamivir (Tamiflu) or zanamivir is recommended as early as possible, ideally within 48 hours of symptom onset, though treatment should not be withheld simply because that window has passed. In the U.S., the CDC and state health departments coordinate testing and treatment access for suspected human cases.

On vaccines: there is no commercially available H5N1 vaccine approved for general public use as of mid-2026, but candidate vaccines have been developed and stockpiled in several countries as part of pandemic preparedness plans. Regulatory review processes are ongoing. The situation is evolving, and public health authorities will announce any changes to vaccination recommendations if and when they occur.

Where to check current outbreak data

The landscape of bird flu outbreaks changes frequently. For the most current picture, these are the authoritative sources worth bookmarking: the WHO's avian influenza page for confirmed human cases and risk assessments; WOAH's WAHIS dashboard for animal outbreak notifications by country and species; the FAO's EMPRES Global Animal Disease Information System for trend data; and the CDC's bird flu response page for U.S.-specific human and animal case tracking. National agriculture and veterinary agencies in each country also publish regular situation reports when outbreaks are active. Checking these primary sources, rather than relying on news headlines, will give you a far more accurate picture of whether bird flu poses any genuine risk in your specific location.