30/06/2026
Avian Influenza (bird flu) : H5N1
There are many different subtypes of avian influenza (bird flu) viruses; A(H5N1) viruses have accounted for most human cases reported globally since 1997. This report focuses on human cases of H5N1 bird flu reported internationally since August 4, 2025, when CDC last published a summary of human infections with avian influenza A(H5N1) viruses (H5N1 bird flu) reported internationally.
Since August 2025, there have been an additional 12 cases of H5N1 bird flu reported internationally. These A(H5N1) virus infections occurred in three countries: Bangladesh, Cambodia, and India. As of June 10, 2026, 1,022 cases have now been reported worldwide since 1997. Most A(H5N1) virus infections in other countries have been associated with a different clade (i.e., genetic grouping) of A(H5N1) viruses than cases reported in the United States, and generally have a high mortality rate. International cases have mostly occurred after direct or close exposure to infected sick or dead poultry.
Five subtypes of bird flu viruses are known to have infected people. These are called A(H5), A(H6), A(H7), A(H9), and A(H10) viruses. Among these, A(H5), A(H7) and A(H9) viruses have caused the most human infections.
https://www.cdc.gov/bird-flu/spotlights/global-summary-06262026.html
