avian flu

Since 2022, a new, highly pathogenic strain of H5N1 influenza or “bird flu” has spread worldwide. In the U.S. it has affected over 100 million birds and for the first time, spread into dairy cows and a small, but growing, number of people. At UC Davis, experts in One Health — an approach that considers the health of people, animals and the environment together — are on high alert.

Dead silence met Marcela Uhart and her team when they arrived at the elephant seal colony at Punta Delgada, Patagonia on Oct. 10, 2023.

The discovery of fragments of avian flu virus in milk sold in U.S. stores, including in about 20% of samples in initial testing across the country, suggests that the H5N1 virus may be more widespread in dairy cattle than previously realized.

A poultry expert at the UC Davis School of Veterinary Medicine (SVM) has teamed up with a geographic information systems (GIS) expert at UC Agriculture and Natural Resources (ANR) and two wildlife health experts from the UC Davis SVM Wildlife Health Center (WHC) to create a map showing the spread of highly pathogenic avian influenza (HPAI) since 2021.