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Influenza Risk Assessment Tool (IRAT) Virus Report : Highly pathogenic avian influenza A(H5N1) virus; clade 2.3.4.4b Virus Strain: A/mink/Spain/3691-8_22VIR10586-10
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04/01/2023
[PDF-484.62 KB]
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Alternative Title:Influenza Risk Assessment Tool (IRAT)—Virus Report
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Description:Date of Evaluation: April 2023
Prepared by the CDC Influenza Division
Human infections with influenza A viruses that commonly circulate among animals are rare, and the likelihood of sustained human-to-human transmission of these viruses remains low [1,2]. Sporadic human infections with animal influenza A viruses have occurred, usually after exposure to infected animals or to a virus-contaminated environment. In order to prioritize and maximize pandemic preparedness investments, the Influenza Risk Assessment Tool (IRAT) was created [3]. The IRAT is used to examine multiple attributes of influenza A viruses that circulate among animals but have not gained the ability to transmit from human-to-human, and to evaluate the potential of these viruses to acquire this ability and the consequent potential public health impact. The IRAT is an evaluative tool, not a predictive tool, and is not intended to predict the next pandemic.
Since January 2022, highly pathogenic avian influenza A(H5N1) virus (AIV) clade 2.3.4.4b has been detected in the United States in numerous wild bird species, including aquatic birds such as ducks, and in commercial and backyard domestic poultry in multiple states.
Running title: Influenza Risk Assessment Tool (IRAT)—Virus Report
H5N1-Mink-10-2022.pdf
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