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  • CDC - ​​​​​​​H5 Bird Flu: Current Situation - January 24+


    January 24, 2025
    Español


    H5 Bird Flu: Current Situation

    What to know
    • H5 bird flu is widespread in wild birds worldwide and is causing outbreaks in poultry and U.S. dairy cows with several recent human cases in U.S. dairy and poultry workers.
    • While the current public health risk is low, CDC is watching the situation carefully and working with states to monitor people with animal exposures.
    • CDC is using its flu surveillance systems to monitor for H5 bird flu activity in people.

    Current situation

    H5 Bird Flu Detections in USA


    • Dairy cattle: Ongoing multi-state outbreak

    • Wild Birds: Widespread

    • Poultry Flocks: Sporadic outbreaks

    • Mammals: Sporadic infections

    • Person-to-person spread: None

    • Current public health risk: Low

    67 Confirmed Total Reported Human Cases in the United States

    1 Death Associated with H5N1 Bird Flu Infection in the United States


    Confirmed human case summary since 2024, by state and exposure source

    Exposure Source
    36 0 0 2 38
    1 9 0 0 10
    0 1 0 0 1
    0 0 1 0 1
    2 0 0 0 2
    0 0 0 1 1
    0 1 0 0 1
    1 0 0 0 1
    0 11 0 0 11
    0 1 0 0 1
    40 23 1 3 67
    NOTE: One additional case was previously detected in a poultry worker in Colorado in 2022. Louisiana reported the first H5 bird flu death in the U.S.

    Exposure was related to other animals such as backyard flocks, wild birds, or other mammals
    Exposure source was not able to be identified
    Probable human case summary during the 2024 outbreak, by state and exposure source


    When a case tests positive for H5 at a public health laboratory but testing at CDC is not able to confirm H5 infection, per Council of State and Territorial Epidemiologists (CSTE) guidance, a case is reported as probable.
    • Probable cases with commercial poultry exposure (e.g., poultry farms or culling operations):
      • Washington (3)
      • Arizona (2)
    • Probable cases with commercial dairy (cattle) exposure:
      • California (1)
    • Probable cases with exposure source unknown:
      • Delaware (1)

    Confirmed and probable cases are typically updated by 5 PM EST on Mondays (for cases confirmed by CDC on Friday, Saturday, or Sunday), Wednesdays (for cases confirmed by CDC on Monday or Tuesday), and Fridays (for cases confirmed by CDC on Wednesday and Thursday). Affected states may report cases more frequently.


    H5 Monitoring in People


    CDC influenza (flu) surveillance systems show no indicators of unusual influenza activity in people, including avian influenza A(H5).
    Monitoring Current Situation


    National flu surveillance (since February 25, 2024)

    Specimens tested

    96,000+

    specimens tested that would have detected influenza A(H5) or other novel influenza viruses


    Human cases

    3

    case detected through national flu surveillance



    Targeted H5 surveillance (since March 24, 2024)

    Total people monitored

    13,400+

    after exposure to infected animals


    Total people tested

    600+

    after exposure to infected animals


    Human cases

    64

    cases detected through targeted H5 surveillance

    Total people monitored and total people tested will be updated weekly on Fridays. Human cases are typically updated by 5 PM EST on Mondays, Wednesdays and Fridays. CDC numbers on specimens tested for national flu surveillance is the number of seasonal flu tests conducted by public health labs. CDC numbers on H5 testing and monitoring are based on weekly state aggregate reports since 2022. CDC defers to states for updated information on people being monitored and tested. March 24, 2024, was the date of the first reported dairy cow infections in the United States. April 1, 2024, was the date of the first reported human case in the United States since the outbreaks in dairy cows began. Infected animals include poultry, dairy cows, and other birds and mammals.


    Detections in Animals
    • 10,969 wild birds detected as of 1/16/2025 | Full Report
    • 51 jurisdictions with bird flu in wild birds
    • 136,327,394 poultry affected as of 1/17/2024 | Full Report
    • 51 states with outbreaks in poultry
    • 928 dairy herds affected as of 1/16/2024 | Full Report
    • 16 states with outbreaks in dairy cows

    These data will be updated daily, Monday through Friday, after 4 p.m. to reflect any new data.

    Cumulative data on wild birds have been collected since January 20, 2022. Cumulative data on poultry have been collected since February 8, 2022. Cumulative data on humans in the U.S. have been collected since April 28, 2022. Cumulative data on dairy cattle have been collected since March 25, 2024.

    What CDC is doing

    CDC Activities and Accomplishments to Date in 2024—2025 H5 Bird Flu Response
    The current outbreak began in late March 2024 with the detection of H5N1 bird flu in dairy cows.Jan 17, 2025
    H5 Bird Flu Response: Focus Areas for Ongoing Public Health Risk Assessment
    CDC continues to assess that the current H5N1 bird flu risk to the general public remains low.Jan 15, 2025
    Interim Guidance for Employers to Reduce Exposure to Avian Influenza A Viruses for People Working with Animals
    This guidance identifies select occupational groups that may be at risk to novel influenza A virusesJan 10, 2025
    Information for Employers Providing Personal Protective Equipment to Reduce Exposure to Avian Influenza A Viruses
    This guidance identifies select occupational groups that may be at risk to novel influenza A virusesJan 6, 2025
    Information for Workers Exposed to H5N1 Bird Flu
    H5N1 bird flu is a virus that has recently been detected for the first time in cows.Jan 6, 2025
    Genetic Sequences of Highly Pathogenic Avian Influenza A(H5N1) Viruses Identified in a Person in Louisiana
    CDC has sequenced the influenza viruses in specimens collected from the patient in Louisiana who was Dec 26, 2024

    Protective Actions for PeopleOn This PageRelated Pages
    View AllBird Flu
    Back to Top
    Bird Flu in Humans
    Sources​​

    https://www.cdc.gov/bird-flu/situati...%2Fwww.cdc.gov %2Fbird-flu%2Fphp%2Favian-flu-summary%2Findex.html

  • #2
    January 27, 2025
    H5 Bird Flu: Current Situation

    WHAT TO KNOW
    • H5 bird flu is widespread in wild birds worldwide and is causing outbreaks in poultry and U.S. dairy cows with several recent human cases in U.S. dairy and poultry workers.
    • While the current public health risk is low, CDC is watching the situation carefully and working with states to monitor people with animal exposures.
    • CDC is using its flu surveillance systems to monitor for H5 bird flu activity in people.

    Current Situation
    H5 Bird Flu Detections in USA

    • Dairy cattle: Ongoing multi-state outbreak

    • Wild Birds: Widespread

    • Poultry Flocks: Sporadic outbreaks

    • Mammals: Sporadic infections

    • Person-to-person spread: None

    • Current public health risk: Low

    Click image for larger version  Name:	Screenshot 2025-01-27 at 4.55.51 PM.png Views:	4 Size:	43.3 KB ID:	1005951

    Probable human case summary during the 2024 outbreak, by state and exposure source

    When a case tests positive for H5 at a public health laboratory but testing at CDC is not able to confirm H5 infection, per Council of State and Territorial Epidemiologists (CSTE) guidance, a case is reported as probable.
    • Probable cases with commercial poultry exposure (e.g., poultry farms or culling operations):
      • Washington (3)
      • Arizona (2)
    • Probable cases with commercial dairy (cattle) exposure:
      • California (1)
    • Probable cases with exposure source unknown:
      • Delaware (1)

    Confirmed and probable cases are typically updated by 5 PM EST on Mondays (for cases confirmed by CDC on Friday, Saturday, or Sunday), Wednesdays (for cases confirmed by CDC on Monday or Tuesday), and Fridays (for cases confirmed by CDC on Wednesday and Thursday). Affected states may report cases more frequently. H5 Monitoring in People


    CDC influenza (flu) surveillance systems show no indicators of unusual influenza activity in people, including avian influenza A(H5).


    ​Continued: https://www.cdc.gov/bird-flu/situati...ary/index.html

    Comment


    • #3
      Posted on January 31, 2025. No changes. No new update for Monday, February 3, 2025.


      January 31, 2025

      Español CDC’s website is being modified to comply with President Trump’s Executive Orders.



      H5 Bird Flu: Current Situation

      What to know
      • H5 bird flu is widespread in wild birds worldwide and is causing outbreaks in poultry and U.S. dairy cows with several recent human cases in U.S. dairy and poultry workers.
      • While the current public health risk is low, CDC is watching the situation carefully and working with states to monitor people with animal exposures.
      • CDC is using its flu surveillance systems to monitor for H5 bird flu activity in people.

      Current situation

      H5 Bird Flu Detections in USA


      • Dairy cattle: Ongoing multi-state outbreak

      • Wild Birds: Widespread

      • Poultry Flocks: Sporadic outbreaks

      • Mammals: Sporadic infections

      • Person-to-person spread: None

      • Current public health risk: Low

      67Confirmed Total Reported Human Cases in the United States

      1Death Associated with H5N1 Bird Flu Infection in the United States Confirmed human case summary since 2024, by state and exposure source

      Exposure Source
      36 0 0 2 38
      1 9 0 0 10
      0 1 0 0 1
      0 0 1 0 1
      2 0 0 0 2
      0 0 0 1 1
      0 1 0 0 1
      1 0 0 0 1
      0 11 0 0 11
      0 1 0 0 1
      40 23 1 3 67
      NOTE: One additional case was previously detected in a poultry worker in Colorado in 2022. Louisiana reported the first H5 bird flu death in the U.S.

      Exposure was related to other animals such as backyard flocks, wild birds, or other mammals
      Exposure source was not able to be identified
      Probable human case summary during the 2024 outbreak, by state and exposure source


      When a case tests positive for H5 at a public health laboratory but testing at CDC is not able to confirm H5 infection, per Council of State and Territorial Epidemiologists (CSTE) guidance, a case is reported as probable.
      • Probable cases with commercial poultry exposure (e.g., poultry farms or culling operations):
        • Washington (3)
        • Arizona (2)
      • Probable cases with commercial dairy (cattle) exposure:
        • California (1)
      • Probable cases with exposure source unknown:
        • Delaware (1)

      Confirmed and probable cases are typically updated by 5 PM EST on Mondays (for cases confirmed by CDC on Friday, Saturday, or Sunday), Wednesdays (for cases confirmed by CDC on Monday or Tuesday), and Fridays (for cases confirmed by CDC on Wednesday and Thursday). Affected states may report cases more frequently. H5 Monitoring in People


      CDC influenza (flu) surveillance systems show no indicators of unusual influenza activity in people, including avian influenza A(H5).
      Monitoring Current Situation National flu surveillance (since February 25, 2024)

      Specimens tested

      104,000+

      specimens tested that would have detected influenza A(H5) or other novel influenza viruses Human cases

      4

      case detected through national flu surveillance Targeted H5 surveillance (since March 24, 2024)

      Total people monitored

      14,100+

      after exposure to infected animals Total people tested

      660+

      after exposure to infected animals Human cases

      63

      cases detected through targeted H5 surveillance

      Total people monitored and total people tested will be updated weekly on Fridays. Human cases are typically updated by 5 PM EST on Mondays, Wednesdays and Fridays. CDC numbers on specimens tested for national flu surveillance is the number of seasonal flu tests conducted by public health labs. CDC numbers on H5 testing and monitoring are based on weekly state aggregate reports since 2022. CDC defers to states for updated information on people being monitored and tested. March 24, 2024, was the date of the first reported dairy cow infections in the United States. April 1, 2024, was the date of the first reported human case in the United States since the outbreaks in dairy cows began. Infected animals include poultry, dairy cows, and other birds and mammals. Detections in Animals
      • 11,065wild birds detected as of 1/28/2025 | Full Report
      • 51 jurisdictions with bird flu in wild birds
      • 149,964,521poultry affected as of 1/31/2024 | Full Report
      • 51 states with outbreaks in poultry
      • 951 dairy herds affected as of 1/31/2024 | Full Report
      • 16 states with outbreaks in dairy cows

      These data will be updated daily, Monday through Friday, after 4 p.m. to reflect any new data.

      Cumulative data on wild birds have been collected since January 20, 2022. Cumulative data on poultry have been collected since February 8, 2022. Cumulative data on humans in the U.S. have been collected since April 28, 2022. Cumulative data on dairy cattle have been collected since March 25, 2024.

      What CDC is doing

      CDC Activities and Accomplishments to Date in 2024—2025 H5 Bird Flu Response
      The current outbreak began in late March 2024 with the detection of H5N1 bird flu in dairy cows.Jan 17, 2025
      H5 Bird Flu Response: Focus Areas for Ongoing Public Health Risk Assessment
      CDC continues to assess that the current H5N1 bird flu risk to the general public remains low.Jan 15, 2025
      Interim Guidance for Employers to Reduce Exposure to Avian Influenza A Viruses for People Working with Animals
      This guidance identifies select occupational groups that may be at risk to novel influenza A virusesJan 10, 2025
      Information for Employers Providing Personal Protective Equipment to Reduce Exposure to Avian Influenza A Viruses
      This guidance identifies select occupational groups that may be at risk to novel influenza A virusesJan 6, 2025
      Information for Workers Exposed to H5N1 Bird Flu
      H5N1 bird flu is a virus that has recently been detected for the first time in cows.Jan 6, 2025
      Genetic Sequences of Highly Pathogenic Avian Influenza A(H5N1) Viruses Identified in a Person in Louisiana
      CDC has sequenced the influenza viruses in specimens collected from the patient in Louisiana who wasDec 26, 2024
      Protective Actions for PeopleOn This PageRelated Pages
      View AllBird Flu
      Back to Top
      Bird Flu in Humans
      Sources


      https://www.cdc.gov/bird-flu/situation-summary/index.html?CDC_AA_refVal=https%3A%2F%2Fwww.cdc.gov %2Fbird-flu%2Fphp%2Favian-flu-summary%2Findex.html

      Comment


      • #4
        No changes to human case count.


        February 7, 2025


        H5 Bird Flu: Current Situation

        What to know
        • H5 bird flu is widespread in wild birds worldwide and is causing outbreaks in poultry and U.S. dairy cows with several recent human cases in U.S. dairy and poultry workers.
        • While the current public health risk is low, CDC is watching the situation carefully and working with states to monitor people with animal exposures.
        • CDC is using its flu surveillance systems to monitor for H5 bird flu activity in people.

        Current situation

        H5 Bird Flu Detections in USA


        • Dairy cattle: Ongoing multi-state outbreak

        • Wild Birds: Widespread

        • Poultry Flocks: Sporadic outbreaks

        • Mammals: Sporadic infections

        • Person-to-person spread: None

        • Current public health risk: Low

        67Confirmed Total Reported Human Cases in the United States

        1Death Associated with H5N1 Bird Flu Infection in the United States


        Confirmed human case summary since 2024, by state and exposure source

        Exposure Source
        36 0 0 2 38
        1 9 0 0 10
        0 1 0 0 1
        0 0 1 0 1
        2 0 0 0 2
        0 0 0 1 1
        0 1 0 0 1
        1 0 0 0 1
        0 11 0 0 11
        0 1 0 0 1
        40 23 1 3 67
        NOTE: One additional case was previously detected in a poultry worker in Colorado in 2022. Louisiana reported the first H5 bird flu death in the U.S.

        Exposure was related to other animals such as backyard flocks, wild birds, or other mammals
        Exposure source was not able to be identified
        Probable human case summary during the 2024 outbreak, by state and exposure source


        When a case tests positive for H5 at a public health laboratory but testing at CDC is not able to confirm H5 infection, per Council of State and Territorial Epidemiologists (CSTE) guidance, a case is reported as probable.
        • Probable cases with commercial poultry exposure (e.g., poultry farms or culling operations):
          • Washington (3)
          • Arizona (2)
        • Probable cases with commercial dairy (cattle) exposure:
          • California (1)
        • Probable cases with exposure source unknown:
          • Delaware (1)

        Confirmed and probable cases are typically updated by 5 PM EST on Mondays (for cases confirmed by CDC on Friday, Saturday, or Sunday), Wednesdays (for cases confirmed by CDC on Monday or Tuesday), and Fridays (for cases confirmed by CDC on Wednesday and Thursday). Affected states may report cases more frequently.


        H5 Monitoring in People


        CDC influenza (flu) surveillance systems show no indicators of unusual influenza activity in people, including avian influenza A(H5).
        Monitoring Current Situation


        National flu surveillance (since February 25, 2024)

        Specimens tested

        116,000+

        specimens tested that would have detected influenza A(H5) or other novel influenza viruses


        Human cases

        4

        case detected through national flu surveillance


        Targeted H5 surveillance (since March 24, 2024)

        Total people monitored

        14,400+

        after exposure to infected animals


        Total people tested

        700+

        after exposure to infected animals


        Human cases

        63

        cases detected through targeted H5 surveillance

        Total people monitored and total people tested will be updated weekly on Fridays. Human cases are typically updated by 5 PM EST on Mondays, Wednesdays and Fridays. CDC numbers on specimens tested for national flu surveillance is the number of seasonal flu tests conducted by public health labs. CDC numbers on H5 testing and monitoring are based on weekly state aggregate reports since 2022. CDC defers to states for updated information on people being monitored and tested. March 24, 2024, was the date of the first reported dairy cow infections in the United States. April 1, 2024, was the date of the first reported human case in the United States since the outbreaks in dairy cows began. Infected animals include poultry, dairy cows, and other birds and mammals.


        Detections in Animals
        • 11,627wild birds detected as of 2/5/2025 | Full Report
        • 51 jurisdictions with bird flu in wild birds
        • 156,254,271poultry affected as of 2/6/2025 | Full Report
        • 51 jurisdictions with outbreaks in poultry
        • 16 states with outbreaks in dairy cows

        These data will be updated daily, Monday through Friday, after 4 p.m. to reflect any new data.

        Cumulative data on wild birds have been collected since January 20, 2022. Cumulative data on poultry have been collected since February 8, 2022. Cumulative data on humans in the U.S. have been collected since April 28, 2022. Cumulative data on dairy cattle have been collected since March 25, 2024.

        What CDC is doing

        CDC Activities and Accomplishments to Date in 2024—2025 H5 Bird Flu Response
        The current outbreak began in late March 2024 with the detection of H5N1 bird flu in dairy cows.Jan 17, 2025
        H5 Bird Flu Response: Focus Areas for Ongoing Public Health Risk Assessment
        CDC continues to assess that the current H5N1 bird flu risk to the general public remains low.Jan 15, 2025
        Interim Guidance for Employers to Reduce Exposure to Avian Influenza A Viruses for People Working with Animals
        This guidance identifies select occupational groups that may be at risk to novel influenza A virusesJan 10, 2025
        Information for Employers Providing Personal Protective Equipment to Reduce Exposure to Avian Influenza A Viruses
        This guidance identifies select occupational groups that may be at risk to novel influenza A virusesJan 6, 2025
        Information for Workers Exposed to H5N1 Bird Flu
        H5N1 bird flu is a virus that has recently been detected for the first time in cows.Jan 6, 2025
        Genetic Sequences of Highly Pathogenic Avian Influenza A(H5N1) Viruses Identified in a Person in Louisiana
        CDC has sequenced the influenza viruses in specimens collected from the patient in Louisiana who wasDec 26, 2024


        Protective Actions for PeopleOn This PageRelated Pages
        View AllBird Flu
        Back to Top
        Bird Flu in Humans


        https://www.cdc.gov/bird-flu/situation-summary/index.html?CDC_AA_refVal=https%3A%2F%2Fwww.cdc.gov %2Fbird-flu%2Fphp%2Favian-flu-summary%2Findex.html

        Comment


        • #5
          H5 Bird Flu: Current Situation

          ​FEBRUARY 10, 2025 WHAT TO KNOW
          • H5 bird flu is widespread in wild birds worldwide and is causing outbreaks in poultry and U.S. dairy cows with several recent human cases in U.S. dairy and poultry workers.
          • While the current public health risk is low, CDC is watching the situation carefully and working with states to monitor people with animal exposures.
          • CDC is using its flu surveillance systems to monitor for H5 bird flu activity in people.
          Current situation

          H5 Bird Flu Detections in USA


          • Dairy cattle: Ongoing multi-state outbreak

          • Wild Birds: Widespread

          • Poultry Flocks: Sporadic outbreaks

          • Mammals: Sporadic infections

          • Person-to-person spread: None

          • Current public health risk: Low

          Click image for larger version

Name:	Screenshot 2025-02-10 at 3.25.16 PM.png
Views:	52
Size:	44.0 KB
ID:	1007289

          Click image for larger version

Name:	Screenshot 2025-02-10 at 3.26.36 PM.png
Views:	48
Size:	126.1 KB
ID:	1007290



          NOTE: One additional case was previously detected in a poultry worker in Colorado in 2022. Louisiana reported the first H5 bird flu death in the U.S.

          Exposure was related to other animals such as backyard flocks, wild birds, or other mammals
          Exposure source was not able to be identified
          Probable human case summary during the 2024 outbreak, by state and exposure source


          When a case tests positive for H5 at a public health laboratory but testing at CDC is not able to confirm H5 infection, per Council of State and Territorial Epidemiologists (CSTE) guidance, a case is reported as probable.
          • Probable cases with commercial poultry exposure (e.g., poultry farms or culling operations):
            • Washington (3)
            • Arizona (2)
          • Probable cases with commercial dairy (cattle) exposure:
            • California (1)
          • Probable cases with exposure source unknown:
            • Delaware (1)

          Confirmed and probable cases are typically updated by 5 PM EST on Mondays (for cases confirmed by CDC on Friday, Saturday, or Sunday), Wednesdays (for cases confirmed by CDC on Monday or Tuesday), and Fridays (for cases confirmed by CDC on Wednesday and Thursday). Affected states may report cases more frequently.

          Click image for larger version

Name:	Screenshot 2025-02-10 at 3.27.54 PM.png
Views:	49
Size:	202.1 KB
ID:	1007291

          Detections in Animals
          • 11,627wild birds detected as of 2/5/2025 | Full Report
          • 51 jurisdictions with bird flu in wild birds
          • 156,254,271poultry affected as of 2/6/2025 | Full Report
          • 51 jurisdictions with outbreaks in poultry
          • 16 states with outbreaks in dairy cows

          These data will be updated daily, Monday through Friday, after 4 p.m. to reflect any new data.

          Cumulative data on wild birds have been collected since January 20, 2022. Cumulative data on poultry have been collected since February 8, 2022. Cumulative data on humans in the U.S. have been collected since April 28, 2022. Cumulative data on dairy cattle have been collected since March 25, 2024.


          H5 bird flu is causing outbreaks in wild birds and poultry, other animals and sporadic human cases.

          Comment

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