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Weekly U.S. Influenza Surveillance Report
Updated September 13, 2024
Excerpt:
Novel Influenza A Virus:
One new human infection with a novel influenza A virus was reported by the Missouri Department of Health and Senior Services. The patient was infected with an influenza A(H5) virus.
The patient is >18 years and has multiple underlying medical conditions. The patient developed symptoms during the week ending August 24, 2024, was hospitalized, and has since recovered. A respiratory specimen collected from the patient tested positive for influenza A at the hospital. The specimen was then forwarded to the Missouri State Public Health Laboratory (MSPHL) with the Department of Health and Senior Services as part of routine influenza surveillance. CDC confirmed the infection was caused by an influenza A (H5) virus. A subsequent investigation by state and local public health officials did not find any known direct or indirect contact with wild birds, domestic poultry, cattle (including no consumption of raw dairy products), or other wildlife prior to the patient’s illness onset. One close contact of the patient was also ill at the same time, was not tested, and has since recovered.
During the 2023-2024 influenza season, a total of 14 cases of human infection with influenza A (H5) virus have been reported in the United States. Four of these occurred in individuals working with dairy cows, nine in individuals associated with poultry depopulation and disposal, and one in an individual with an unknown source of exposure. An ongoing outbreak of H5N1 continues in domestic dairy cows and poultry, and monitoring for additional human cases is ongoing.
Seven variant influenza virus cases were also reported during the 2023-2024 season (four A(H1N2)v, two A(H3N2)v, and one A(H1N1)v virus), for a total of 20 novel influenza A virus cases reported this season.
Information about avian influenza is available at https://www.cdc.gov/flu/avianflu/index.htm.
Updated September 13, 2024
Excerpt:
Novel Influenza A Virus:
One new human infection with a novel influenza A virus was reported by the Missouri Department of Health and Senior Services. The patient was infected with an influenza A(H5) virus.
The patient is >18 years and has multiple underlying medical conditions. The patient developed symptoms during the week ending August 24, 2024, was hospitalized, and has since recovered. A respiratory specimen collected from the patient tested positive for influenza A at the hospital. The specimen was then forwarded to the Missouri State Public Health Laboratory (MSPHL) with the Department of Health and Senior Services as part of routine influenza surveillance. CDC confirmed the infection was caused by an influenza A (H5) virus. A subsequent investigation by state and local public health officials did not find any known direct or indirect contact with wild birds, domestic poultry, cattle (including no consumption of raw dairy products), or other wildlife prior to the patient’s illness onset. One close contact of the patient was also ill at the same time, was not tested, and has since recovered.
During the 2023-2024 influenza season, a total of 14 cases of human infection with influenza A (H5) virus have been reported in the United States. Four of these occurred in individuals working with dairy cows, nine in individuals associated with poultry depopulation and disposal, and one in an individual with an unknown source of exposure. An ongoing outbreak of H5N1 continues in domestic dairy cows and poultry, and monitoring for additional human cases is ongoing.
Seven variant influenza virus cases were also reported during the 2023-2024 season (four A(H1N2)v, two A(H3N2)v, and one A(H1N1)v virus), for a total of 20 novel influenza A virus cases reported this season.
Information about avian influenza is available at https://www.cdc.gov/flu/avianflu/index.htm.
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