Results of Influenza Risk Assessment Tool

The Influenza Risk Assessment Tool (IRAT) is a CDC evaluation tool developed with assistance from global animal and human health influenza experts.
The IRAT is used to assess the potential pandemic risk of influenza A viruses that are not currently circulating in people.
This latest IRAT assessed two recent clade 2.3.4.4b avian influenza A(H5N1) viruses: A/California/147/2024 and A/Washington/239/2024.
These viruses scored in the "moderate risk" category for potential emergence and public health impact, similar to previous assessments of earlier clade 2.3.4.4b avian influenza A(H5N1) viruses. These results validate the proactive, coordinated U.S. government response.
The IRAT does not assess the immediate risk to the public's health, which is unchanged and remains low, and it does not predict future pandemics.

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