The vaccine is intended for those most exposed to potential transfers of avian influenza from birds or animals, such as poultry farm workers and veterinarians.

This report provides an update to the April 26, 2024, report to include three additional sporadic human cases (1 in Australia and 2 in the United States) and recent activity in the United States.

Finland has become the first country in the EU to vaccinate against the H5N1 avian flu.

New findings point to the milking process as a possible route of avian-influenza spread between cows — and from cow to human.

On 23 May 2024, the Mexico International Health Regulations (IHR) National Focal Point (NFP) reported to PAHO/WHO a confirmed fatal case of human infection with avian influenza A(H5N2) virus.

CDC continues to respond to the public health challenge posed by a multistate outbreak of avian influenza A(H5N1) virus, or “A(H5N1) virus,” in dairy cows and other animals in the United States.

None of the three cases are associated with the others. As with the previous two cases (one in Texas, one in Michigan), the person is a dairy farm worker with exposure to infected cows, making this another instance of probable cow-to-person spread.

What happens in a dairy herd with HPAI? What should I expect if my herd became infected? This case report describes what one farmer has faced since herd infection began.