Bird Flu (Avian Influenza): Symptoms in Humans, Risk, and Treatment
Medically reviewed by Linda Girgis | MD on July 21st, 2026 and Alan Lucks | MD on November 4th, 2026.
Published on February 28th, 2026.
Key Takeaways
Avian flu is a viral infection that mainly affects birds but can spread to humans in rare cases
Risk to the general public remains low; no H5N1 human cases were reported through week 38 of the 2025–26 season
Most human cases occur from direct contact with infected birds or contaminated surfaces
Symptoms range from mild cold-like illness to severe respiratory problems
Early treatment with antiviral medications can help reduce symptom severity
Prevention focuses on avoiding contact with wild birds and following food safety practices
Bird Flu Symptoms in Humans
Avian flu symptoms in humans can vary widely. Some people have mild symptoms that feel like a regular cold. Others develop severe illness that affects their breathing and other body systems. Mild cases can also be hard to tell apart from seasonal flu (influenza).
Mild symptoms
Fever and chills: Body temperature often rises above 100°F (38°C) with accompanying chills
Cough and sore throat: Dry cough that may produce mucus, along with throat irritation
Muscle aches and fatigue: Body aches and tiredness that can make daily activities harder
Eye redness (conjunctivitis): Red, irritated eyes that can be the first or only symptom in some H5N1 cases
Severe symptoms
Shortness of breath: Difficulty breathing that may worsen with mild activity or at rest
Chest pain: Pain or pressure in the chest, especially when breathing or coughing
Confusion: Trouble thinking clearly or sudden changes in alertness
When to seek care
Contact a doctor right away if you develop flu-like symptoms after contact with birds or infected dairy cattle, or after drinking raw milk. Bird contact includes handling sick or dead birds, visiting poultry farms, or traveling to areas with known outbreaks.
Symptoms usually appear 2 to 3 days after infection. Some people may not feel sick right away, making early detection harder. Keeping track of when symptoms start helps doctors provide better care and faster treatment.
When to seek immediate care
Get emergency medical help right away if you have any of the severe symptoms above, especially after contact with birds or dairy cattle.
What Is Bird Flu (Avian Influenza)?
Avian flu, also called bird flu, is a type of influenza A virus that mainly infects birds. The virus spreads easily among wild birds like ducks, geese, and gulls. It can also infect domestic birds such as chickens and turkeys.
While avian flu rarely spreads to humans, it can happen when people have close contact with infected birds. The virus has caused serious illness in some people who caught it. Most human cases have occurred in people who work with poultry or live in areas with infected bird populations.
The CDC monitors avian flu outbreaks closely. They track both bird and human cases to prevent larger outbreaks. Understanding this condition helps people take proper precautions and know when to seek medical care. For now, the CDC says the risk to the general public from this influenza A virus remains low (more on that below).
Bird Flu Risk in the U.S. Right Now
The risk of bird flu to the general public in the U.S. remains low. The CDC reported no H5N1 human cases through week 38 of the 2025–26 season.
Some people still face higher risk, mainly anyone in close contact with infected birds, dairy cattle, or other animals.
Fever, cough, eye redness, or other flu-like symptoms after that kind of contact? You can talk to a doctor about flu symptoms by video visit on Doctronic, any hour.
Should you be worried about bird flu? Read our closer look at the risk.
How People Catch Bird Flu
Avian flu spreads mainly through contact with infected birds or their droppings. The virus lives in bird saliva, mucus, and feces. It can survive on surfaces for several hours or days, depending on conditions.
People usually catch avian flu by touching contaminated surfaces and then touching their eyes, nose, or mouth. Breathing in virus particles from bird droppings or feathers can also cause infection. Eating undercooked poultry or eggs from infected birds poses another risk. Close contact with infected dairy cattle and drinking raw (unpasteurized) milk are also ways people can be exposed.
The virus enters the body through these routes and begins multiplying inside cells. Once inside, it spreads to the lungs and other organs, causing illness. The severity depends on how much virus someone was exposed to and their overall health.
Age
Children and adults over 65 have higher risk of severe illness
Occupation
Poultry and dairy farm workers, veterinarians, and bird handlers face increased exposure
Travel
Visiting areas with active bird flu outbreaks raises infection risk
Immune system
People with weakened immunity may develop more serious symptoms
Diagnosis
Doctors diagnose bird flu based on symptoms, exposure history, and lab tests. They ask detailed questions about recent contact with birds, travel history, and when symptoms started.
Medical history & physical examination
Doctors focus on respiratory symptoms and recent bird exposure. They listen to your lungs and check for fever, throat redness, and swollen lymph nodes. The timing of symptoms after bird contact helps confirm possible avian flu infection.
A complete physical exam includes checking blood pressure, heart rate, and oxygen levels in the blood. These measurements show how well your lungs and heart are working during illness. Doctors also ask about other medical conditions that might affect treatment choices.
Diagnostic testing
Nasal or throat swab: Collects virus samples for laboratory testing and confirmation
Blood tests: Check for antibodies and signs of viral infection in the bloodstream
Chest X-ray: Shows lung inflammation or pneumonia that may develop with severe cases
Laboratory results usually come back within a few hours to several days. Quick testing helps doctors start treatment as soon as possible. Faster diagnosis often leads to better outcomes and faster recovery.
Talk to a doctor about flu symptoms
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Bird Flu Treatment
Treatment for avian flu focuses on reducing symptoms and preventing complications. Starting treatment early gives the best chance for recovery and reduces the risk of severe illness.
Conservative treatments
Rest and hydration: Getting plenty of sleep and drinking fluids help your body fight the infection
Symptom relief: Over-the-counter pain relievers and fever reducers can improve comfort during recovery
Advanced treatments
Antiviral medications: A licensed doctor may prescribe oseltamivir (Tamiflu) for suspected H5 bird flu, no matter when symptoms began, though starting early works best
Hospitalization: Needed for severe breathing problems or complications like pneumonia
Oxygen therapy: Supports breathing when lung function becomes impaired by the viral infection
Your doctor will choose the best treatment based on how sick you are and other health conditions you have. Following your treatment plan exactly as prescribed gives you the best chance to recover quickly.
Living with the Condition
Most people with mild avian flu recover completely with proper care. Recovery usually takes 1 to 2 weeks with rest and supportive treatment. Following your doctor's instructions helps ensure the best outcome.
Daily management strategies
Stay home from work or school until fever-free for 24 hours. Wash hands frequently and avoid touching your face. Cover coughs and sneezes to prevent spreading illness to family members. Take medications as prescribed and monitor symptoms for changes.
Keep track of your temperature and any new symptoms that develop during recovery. Write down when you take medicines and how you feel afterward. This information helps your doctor know if treatment is working well.
Exercise & movement
Avoid strenuous exercise until you feel completely better. Light activities like short walks may help once fever resolves. Return to normal activities gradually as your energy improves.
Listen to your body and don't push yourself too hard too soon. Pushing too hard can delay recovery or cause a setback. Most people return to full activity within 2 to 3 weeks after symptoms go away.
Prevention
Avoid contact with wild birds: Don't touch sick or dead birds, and stay away from areas with large bird populations during outbreaks
Practice food safety: Cook poultry and eggs thoroughly to internal temperature of 165°F (74°C) before eating
Skip raw milk: Drink only pasteurized milk and dairy products
Wash hands frequently: Use soap and warm water for 20 seconds, especially after any potential bird contact
Use protective equipment: Wear gloves, masks, and protective clothing when handling birds or cleaning bird areas
Keep your living space clean by wiping down surfaces regularly with disinfectant. This reduces the chance of virus survival on items you touch. Special attention to bird feeders, water dishes, and outdoor areas helps prevent infection.
Stay informed about avian flu outbreaks in your area by checking health department websites. Travel warnings help you avoid regions with active cases. Knowing where the virus is active helps you make safer choices about where to go.
Frequently Asked Questions
Rarely: current H5N1 bird flu strains have not shown sustained spread between people. Most human cases result from direct contact with infected birds. However, health officials monitor the virus closely for any changes that might increase human transmission.
No, you cannot catch bird flu from properly cooked chicken or eggs. Cooking poultry to 165°F (74°C) kills the virus completely. The risk comes from handling raw poultry or eating undercooked meat.
No, bird flu and seasonal flu are different viruses. Bird flu mainly affects birds and rarely spreads between people. Seasonal flu shots do not protect against bird flu.
Most people recover from bird flu within 1 to 2 weeks with proper treatment. Mild cases may resolve in just a few days. Severe cases can last longer and may require hospitalization for complete recovery.
Don't touch dead birds with bare hands. Contact your local health department or animal control for proper disposal. If you must handle a dead bird, wear gloves and wash hands thoroughly afterward.
Yes, vaccines against H5N1 bird flu exist, but they are not generally available to the public. They aren't meant for routine use the way a yearly flu shot is. Our guide, is there a bird flu vaccine, explains who can get one and when.
Yes, cats and dogs can catch bird flu, usually from infected birds, raw meat, or raw (unpasteurized) milk. Watch for tiredness, not eating, fever, or trouble breathing, and call your vet if you see them. Keep pets away from wild birds, and don't feed them raw meat or raw milk. Our guide, can dogs get bird flu, covers symptoms and safety in more detail.
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