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An outbreak of H5N1 killed 70% of Southern elephant seal pups born in the 2023 breeding season. In surveyed areas of Península Valdés, Argentina, seal mortality rates reached 96%. [7] In February 2024 it was estimated that the outbreak of H5N1 in South America had killed at least 600,000 wild birds and 50,000 mammals since 2022. [7]
Once infected, the virus can spread by cell-to-cell contact, bypassing receptors. So even if a strain is very hard to initially catch, once infected, it spreads rapidly within a body. [ 38 ] For highly pathogenic H5N1 avian influenza in a human, "the time from the onset to presentation (median, 4 days) or to death (median, 9 to 10 days) has ...
Host cell invasion and replication by the influenza virus. The viral life cycle begins by binding to a target cell. Binding is mediated by the viral HA proteins on the surface of the envelope, which bind to cells that contain sialic acid receptors on the surface of the cell membrane.
Influenza A virus subtype H5N1 (A/H5N1) is a subtype of the influenza A virus, which causes influenza (flu), predominantly in birds. It is enzootic (maintained in the population) in many bird populations, and also panzootic (affecting animals of many species over a wide area). [1]
The main virus involved in the global outbreak is as H5N1 clade 2.3.4.4b, genetic diversification of which with other clades (such as 2.3.2.1c) has seen an evolution in the ability to cause significant outbreaks in a broader range of species, mammals included. [63] [64] [65]
CDC said that it is actively looking at multiple flu indicators to monitor for influenza A, of which H5N1 is a subtype, including looking for signs of spread of the virus to, or among, people, in ...
Flu is not the only virus floating around this time of year. The CDC is also tracking COVID-19 and respiratory syncytial virus (RSV) activity on a weekly basis. Follow The Flu Trends On weather ...
Influenza A virus subtype H5N1 (A/H5N1) is a subtype of the influenza A virus, which causes the disease avian influenza (often referred to as "bird flu"). It is enzootic (maintained in the population) in many bird populations, and also panzootic (affecting animals of many species over a wide area). [1]