How Does Bird Flu Spread to Humans? Symptoms & Ways to Protect Yourself

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Keep yourself & your pets safe from infection as bird flu spreads

Co-authored by Andrea Rudominer, MD, MPH and Bailey Cho

Last Updated: September 1, 2025 Fact Checked

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How Bird Flu Spreads to Humans

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Symptoms

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Protecting Yourself

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Can pets get bird flu?

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Can bird flu kill humans?

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How is bird flu treated?

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More FAQs

Since January 2022, over 145,077,000 birds have been affected with bird flu (avian influenza), and the current outbreak has raised concerns among public health officials.^{[1]
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Centers for Disease Control and Prevention
Main public health institute for the US, run by the Dept. of Health and Human Services

Go to source} If you’re worried whether bird flu can spread between people (and cause a potential pandemic), we’re here to answer all your questions. Keep reading to learn how bird flu can spread in humans, the signs and symptoms of bird flu, and how to treat and prevent the virus.

What causes bird flu (avian influenza) in humans?

Humans get bird flu from close or prolonged contact with infected birds or animals. This includes breathing in the virus, consuming raw milk, or touching an infected animal’s saliva, mucus, or feces. Those who work directly with infected animals are at higher risk of infection. Bird flu is not contagious among humans.

Section 1 of 7:

How Bird Flu Spreads to Humans

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1
People get bird flu from close or prolonged contact with infected birds or animals. Although it’s rare for bird flu to spread from person to person, humans can become infected with bird flu if they come in contact with an infected animal’s body fluid, such as mucus, saliva, or feces. You can also get it by breathing in dust or droplets with the virus, working with or drinking raw milk from infected animals, or by touching your eyes, nose or mouth with unwashed hands after touching contaminated items or surfaces.^{[2]
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- Who’s at the highest risk? People who work with infected animals are at greater risk. This includes poultry, dairy and livestock farmers and workers, veterinarians, public health responders, dairy laboratory workers, food processing workers handling raw milk and hunters.^{[3]
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  Centers for Disease Control and Prevention
  Main public health institute for the US, run by the Dept. of Health and Human Services
  
  Go to source}
- Does bird flu spread by eating chicken? No, poultry that is properly prepared and cooked to an internal temperature of 165°F (73.9°C) is completely safe to eat. Eating uncooked or undercooked poultry can make you sick.^{[4]
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  Centers for Disease Control and Prevention
  Main public health institute for the US, run by the Dept. of Health and Human Services
  
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- Can humans get bird flu from eating eggs? No, as long as you cook your eggs to an internal temperature of 165°F (73.9°C), you will not get sick. Cooking eggs kills bacteria and viruses, including bird flu.^{[5]
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  Centers for Disease Control and Prevention
  Main public health institute for the US, run by the Dept. of Health and Human Services
  
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Humans can’t pass bird flu to each other, but future strains may be contagious. Similar to humans, cattle and other animals can get bird flu by breathing in contaminated dust, eating infected animals, or coming into direct contact with the body fluids of infected animals.^{[6]
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Cleveland Clinic
Educational website from one of the world's leading hospitals

Go to source} The transmission of bird flu to mammals, such as dairy cows, is concerning health officials because it gives the virus the chance to mutate and evolve into a strain that could spread more easily between humans.^{[7]
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- If the current strain of bird flu mutates so it can spread easily between humans, it could cause a pandemic.^{[8]
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  Cleveland Clinic
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- As of January 24, 2025, 67 people and over 935 herds of dairy cattle have been infected with the current strain of bird flu in the U.S. The Centers for Disease Control (CDC) is closely monitoring the situation to ensure person-to-person transmission is not occuring.^{[9]
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Section 2 of 7:

Signs & Symptoms of Avian Bird Flu

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Symptoms of bird flu include pink eye, fever, cough, and sore throat. In the United States, the signs and symptoms of bird flu have ranged from no symptoms or mild to severe. Most people have reported pink eye and mild respiratory symptoms, but some severe and less common symptoms include diarrhea, nausea, vomiting, pneumonia or seizures. Signs and symptoms of bird flu in humans may include:^{[10]
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- Chills
- Fever
- Cough
- Fatigue
- Pink eye
- Sore throat
- Headaches
- Body aches
- Stuffy or runny nose
- Diarrhea, nausea or vomiting
- Pneumonia requiring hospitalization
- Difficulty breathing or shortness of breath (dyspnea)

Section 3 of 7:

How to Protect Yourself From Bird Flu

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Dairy cows and other animals infected with bird flu can pass the virus through their milk, so choosing pasteurized milk and products made with pasteurized milk is the best way to protect yourself from bird flu. Pasteurization kills harmful bacteria and viruses in milk, without affecting the milk’s taste or nutritional value.^{[11]
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Bird flu cannot be transmitted when you cook poultry, meat and eggs to an internal temperature of 165°F (73.9°C). You should also follow food safety guidelines to avoid cross contaminating food, such as keeping raw poultry and eggs away from prepared and uncooked foods.^{[12]
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Although seasonal flu vaccines won’t prevent infection with bird flu viruses, it can reduce the risk of serious illness and getting both bird flu and seasonal influenza at the same time.^{[13]
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Cleveland Clinic
Educational website from one of the world's leading hospitals

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Wash your hands with warm water and soap for at least 20 seconds, especially after contact with animals (or their environments) and before eating and drinking. Alcohol-based hand sanitizers are less effective at inactivating bird flu compared to handwashing.^{[14]
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Avoid contact with wild, sick, or dead birds and livestock. Do not touch or come into contact with animals who are sick or may be infected. This includes surfaces or materials, such as litter or bedding material, that may be contaminated.^{[15]
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Centers for Disease Control and Prevention
Main public health institute for the US, run by the Dept. of Health and Human Services

Go to source} Bird flu can be airborne, so you want to avoid contact with their saliva, feces, mucus and the space the animals occupy.^{[16]
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- If you’re visiting a foreign country with an outbreak, avoid going to live animal markets or poultry farms.^{[17]
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  National Health Service (UK)
  Public healthcare system of the UK
  
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Take extra precautions if you have to contact birds or other animals who may be infected with bird flu. This includes wearing gloves, goggles or a face shield, a NIOSH® approved respirator, coveralls, a head cover, and boots. Try to work outdoors or in well-ventilated indoor areas, and change your clothes and footwear and shower immediately after work.^{[18]
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Section 4 of 7:

Can pets get bird flu?

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Yes, pets can get bird flu if they eat or come into contact with infected animals. Bird flu doesn’t only affect birds—it can spread to cats, dogs and other mammals. Although your pets are unlikely to get the virus, keep them away from dead, infected, or potentially infected animals, and avoid giving them raw milk, raw pet food or unpasteurized dairy products.^{[19]
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Centers for Disease Control and Prevention
Main public health institute for the US, run by the Dept. of Health and Human Services

Go to source} Signs and symptoms of bird flu in dogs and cats include:^{[20]
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- Fever
- Lethargy
- Low appetite
- Difficulty breathing
- Reddened or inflamed eyes
- Discharge from the eyes and nose
- Neurologic signs (tremors, seizures, incoordination or blindness)

Section 5 of 7:

Can bird flu kill humans?

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Bird flu can be fatal, but the severity varies from person to person. Most people recover from bird flu, but some can become severely ill and die. As of now, there has only been one confirmed death from bird flu in the United States, but 464 people have died from bird flu worldwide since 2003.
- If you have symptoms of bird flu, seek medical help immediately.

Section 6 of 7:

How is bird flu treated?

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Antiviral medications can be used to treat bird flu. If you develop symptoms of bird flu after being exposed to raw milk or birds or other animals that may be infected, contact your healthcare provider immediately for testing and treatment.^{[21]
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Research source} They may prescribe antiviral medications, such as Oseltamivir (Tamiflu®), Peramivir (Rapivab®) or Zanamivir (Relenza®) to reduce the severity of the virus, prevent complications and improve the chances of survival.^{[22]
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Cleveland Clinic
Educational website from one of the world's leading hospitals

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- Antiviral medications work best within 48 hours of developing symptoms.^{[23]
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  Centers for Disease Control and Prevention
  Main public health institute for the US, run by the Dept. of Health and Human Services
  
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Section 7 of 7:

Frequently Asked Questions: Bird Flu

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What is bird flu? Also known as avian influenza, bird flu is an infectious type of influenza that usually spreads among birds and other animals. Bird flu viruses normally live in wild water birds, such as ducks and geese, but they can spread to domestic birds, like chickens, guinea hens and turkey, and some other wild and domestic animals, like seals, foxes, cats, and cattle. Bird flu rarely infects people, but there have been some rare cases of human infection with the virus.^{[24]
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- There are many subtypes of bird flu, but the current strain of bird flu that is spreading in the United States and globally is avian influenza A(H5).^{[25]
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  Cleveland Clinic
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No, there is no commercially available vaccine against avian influenza at the moment. The FDA has approved 3 bird flu vaccines in the past (2007, 2013, and 2020), but health officials say these strains are outdated because the virus is always mutating (similar to the seasonal flu).^{[26]
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Research source} The Centers for Disease Control (CDC) has developed candidate vaccines for the current strain, but they will only be used if health officials deem that it’s necessary.^{[27]
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Centers for Disease Control and Prevention
Main public health institute for the US, run by the Dept. of Health and Human Services

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How worried should I be about bird flu? Currently, the Centers for Disease Control (CDC) says bird flu is a low risk to the public, and they are “watching the situation carefully and working with states to monitor people with exposures to animals that are infected or potentially infected.”^{[28]
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Trustworthy Source

Centers for Disease Control and Prevention
Main public health institute for the US, run by the Dept. of Health and Human Services

Go to source} Unless you work with livestock or are around sick birds, you don’t need to be extremely worried at the moment, according to health experts.^{[29]
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- As of January 6, 2025, California has the most human cases of bird flu (37 cases), followed by Washington (11 cases) and Colorado (10 cases).^{[30]
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  Centers for Disease Control and Prevention
  Main public health institute for the US, run by the Dept. of Health and Human Services
  
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Yes, anytime bird flu is found on a poultry farm, the entire flock is euthanized to help prevent the virus from spreading. Since the beginning of this most recent outbreak in 2022, there has been a decrease in the number of egg–laying chickens, which is why egg prices have risen and there has been a shortage of eggs.^{[31]
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