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A(H5) Bird Flu: Current Situation - CDC
CDC is using its flu surveillance systems to monitor for A (H5) bird flu activity in people. On July 7, 2025, CDC streamlined A (H5) bird flu updates with routine influenza data updates and updated reporting cadences to reflect the current public health situation.
Avian Influenza (Bird Flu) - CDC
Avian influenza or bird flu refers to the disease caused by infection with avian (bird) influenza (flu) Type A viruses.
Avian influenza - Wikipedia
Avian influenza (AI), or bird flu, has significantly impacted the poultry industry with economic ramifications felt globally. The virus primarily affects poultry species, and when outbreaks occur, large-scale culling of infected birds is often necessary to prevent further spread.
Avian Influenza (Bird Flu): H5N1, Causes, Symptoms & Treatment
A type of influenza A virus, often H5N1 in humans, causes bird flu. The virus can infect your upper respiratory tract and lungs, and sometimes spread to other parts of your body like your brain.
Bird flu (avian influenza) - Symptoms and causes - Mayo Clinic
Flu viruses in other animals, such as birds, may be a risk to people. Learn more about the symptoms, causes, prevention and treatment for bird flu in people.
Highly Pathogenic Avian Influenza Continues to Affect Wild Birds Across ...
The U.S. Geological Survey’s National Wildlife Health Center is closely monitoring the ongoing impacts of highly pathogenic avian influenza on wild bird populations across the United States as the virus continues to drive significant mortality events nationwide.
Why Bird Flu Is Surging Again—And What It Means for Public Health ...
After a quiet summer, bird flu cases are rising again. Scientists expected the development, but what happens next is still uncertain
Detections of Highly Pathogenic Avian Influenza in Wild Birds
Wild birds can be infected with highly pathogenic avian influenza (HPAI) and show no signs of illness. They can carry the disease to new areas when migrating, potentially exposing domestic poultry to the virus.
Seventy U.S. Bird Flu Cases Underscore How Much We Still Don’t Know
When a highly pathogenic avian influenza virus jumped into American dairy cows in the spring of 2024, scientists worried about the next step: spillover into humans.
Avian Influenza and Wildlife Health: 2025 Year in Review
Avian influenza, once largely limited to poultry, is now reshaping wildlife health across North America, affecting wild birds, mammals, and even people. This 2025 Year in Review highlights how USGS science is helping track, understand, and respond to this rapidly evolving disease. From large-scale wildlife die-offs to new tools for detecting and monitoring the virus, USGS research supports ...
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