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Bird Flu Tracker Avian Influenza A H5N1

Bird Flu Tracker Avian Influenza A H5N1

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Avian influenza or bird flu refers to the disease caused by infection with avian (bird) influenza (flu) Type A viruses. These viruses naturally spread among wild aquatic birds worldwide and can infect domestic poultry and other bird and animal species. Bird flu viruses do not normally infect humans. However, sporadic human infections with bird flu viruses have occurred.

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  • Combating the Persistent Threat of H5N1 Bird Flu in the U.S.

    Combating the Persistent Threat of H5N1 Bird Flu in the U.S.
    Sep 25 2025
    The H5N1 bird flu outbreak remains a top concern for U.S. agriculture and public health, though the latest data suggest declining rates in both animal and human cases. The U.S. Centers for Disease Control and Prevention reports a total of 70 confirmed and probable human H5 cases since 2024, with exposures mainly linked to dairy herds and poultry farms. California continues to lead in case numbers among both animals and people, followed by Colorado and Washington. While the risk to the general public remains low, the CDC is closely monitoring new exposures, particularly among agricultural workers.

    According to the CDC, more than 18,000 people have been monitored for symptoms of bird flu since 2024, with a positivity rate of 18.8% among those exposed to dairy cows. The most vulnerable groups remain farm workers, in part because of limited access to diagnostic testing. The CDC also highlights that the first U.S. death associated with the virus was reported in Louisiana earlier this year.

    Johns Hopkins Public Health notes there have been no new confirmed human cases in the U.S. since February 2025, and the overall level of transmission between animals—and from animals to humans—has dropped, aided by aggressive surveillance and control measures. However, experts stress there are significant gaps in surveillance, including a lack of at-home human testing for H5N1, making it possible that mild or asymptomatic cases could be missed.

    The California Department of Food and Agriculture has confirmed that while virus activity persists, the number of new dairy herd infections is decreasing, with more herds being released from quarantine after successful recovery and ongoing monitoring.

    Nationally, the U.S. Department of Agriculture reports bird flu now detected in commercial and backyard flocks in all 50 states and Puerto Rico. Estimated costs related to control measures and compensations since November 2024 have surpassed $1.4 billion, including over $1.25 billion in payments to affected producers. The virus has continued to circulate among wild birds and in isolated livestock outbreaks, putting ongoing pressure on the poultry and dairy industries.

    Globally, the World Health Organization continues to observe sporadic outbreaks among wild bird and livestock populations, with heightened vigilance in regions with vulnerable poultry industries. While there is no evidence of sustained human-to-human transmission, the potential for viral mutation remains a research priority.

    Thank you for tuning in. Come back next week for more updates. This has been a Quiet Please production—for more, check out Quiet Please Dot A I.

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    3 m
  • Vigilant Monitoring of Avian Influenza as Migratory Season Approaches

    Vigilant Monitoring of Avian Influenza as Migratory Season Approaches
    Sep 23 2025
    The United States is seeing continued, though somewhat reduced, activity related to highly pathogenic avian influenza, or bird flu, as the fall migratory season approaches. According to the CDC, so far in 2025 there continues to be no confirmed human-to-human transmission of the H5 bird flu virus in the US, but experts remain vigilant in monitoring the situation. Over the last year, there have been seventy confirmed cases of bird flu infection in people in the US, resulting in one death. Most cases have stemmed from direct contact with infected animals or materials according to the University of Nebraska Medical Center.

    The virus remains most active in wild bird and poultry populations. Columbia Insight reports that in the Pacific Northwest, there is cautious optimism among wildlife experts, as spring and summer 2025 brought fewer wild bird and mammal deaths than prior years. Scientists hope this signals increased resistance among wildlife but warn the real test will come with fall migration, when millions of birds travel through the region. Notably, bird flu is now widely recognized as endemic in North American wildlife, including mammals such as skunks, cougars, and raccoons, with wildlife agencies urging the public to report sightings of dead animals. Nevertheless, experts still assess the risk to the general public as low, though those handling birds or wild animals should exercise caution.

    Globally, the H5N1 strain continues to cause concern. In Southeast Asia, particularly Cambodia, virologists are alarmed by a sharp rise in human bird flu cases. The Foreign Correspondents Club of Thailand hosted experts last week who revealed that Cambodia has confirmed sixteen human cases this year, eight of which have been fatal, and neighbors like Thailand have raised alert levels in response. Although there are currently no signs the virus has become easily transmissible between people, each spillover into a new species raises the risk that the virus could adapt for easier human-to-human spread. Surveillance activities across Southeast Asia and beyond are being strengthened in alignment with new global pandemic preparedness strategies.

    In Europe, the virus remains active as well, with fresh outbreaks in poultry reported this week in southern Bulgaria affecting tens of thousands of birds, as noted by The Poultry Site. Meanwhile, animal health agencies in the US are also monitoring isolated events, such as a recent outbreak among house cats, with new research from the University of Maryland suggesting early intervention may improve survival for infected animals.

    Thank you for tuning in to this update. Come back next week for more on the global bird flu situation. This has been a Quiet Please production. For more, check out QuietPlease dot AI.

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    3 m
  • Avian Influenza Resurgence: Nebraska Dairy Herd Infected, Concerns Linger for Wildlife and Humans

    Avian Influenza Resurgence: Nebraska Dairy Herd Infected, Concerns Linger for Wildlife and Humans
    Sep 21 2025
    The bird flu remains a dynamic concern as new cases emerge in the United States. In the last 24 hours, national health authorities reported the confirmation of highly pathogenic avian influenza H5N1 in a Nebraska dairy herd, marking the state's first detection in cattle, according to the U.S. Department of Agriculture. This herd, located in central Nebraska, is under quarantine, and preliminary genetic analysis links the strain to viral types previously seen in California. Nebraska's case raises the total number of infected dairy cattle states to eighteen since March 2024, with over 1,790 affected herds nationwide.

    While dairy cattle have seen cases drop over the summer months, recent weeks have brought a resurgence of outbreaks in poultry flocks, especially in South Dakota and North Dakota. The Centers for Disease Control and Prevention report that the current public health risk remains low. Human cases among those exposed to animals have totaled seventy in the U.S. since 2024, with California, Colorado, and Washington among the most impacted states. The only U.S. death so far was attributed to H5N1 exposure in Louisiana.

    The CDC has streamlined its updates to include bird flu tracking with broader influenza surveillance, reflecting the current risk assessment. Human-to-human transmission has not been identified in the United States, which keeps epidemiologists cautiously optimistic about controlling spread among people.

    Wildlife monitoring continues to raise questions, particularly in the Pacific Northwest. Researchers have noted the virus’s expansion beyond birds, now affecting mammals like cougars, bobcats, skunks, and raccoons. In 2024, a major incident involved twenty big cats succumbing to H5N1 at a Washington sanctuary, showing how the virus can jump species. Notably, studies last year confirmed infection in harbor seals, adding another layer of complexity to the epidemic. Scientists think mammals are exposed mainly through scavenging or close contact with infected birds and believe most wildlife populations may be slowly developing increased resistance. Nevertheless, fall migration of birds could potentially bring another uptick in cases, so wildlife agencies urge the public to report sick or deceased animals.

    Globally, no significant new outbreaks have emerged in the past day, but avian flu continues to be closely watched in Europe and Asia, where sporadic animal and rare human cases drive ongoing concern.

    That’s all for this week’s bird flu update. Thank you for tuning in, and please come back next week for the latest on this evolving story. This has been a Quiet Please production. For more, check out Quiet Please Dot A I.

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    4 m
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