In New York, 2025 started off with an increase in bird cases of highly pathogenic avian influenza (HPAI). We found H5N1 in nearly 200 birds thus far, waterfowl and raptors being the most affected. For more information on HPAI, visit our Avian Influenza disease page …

Jun 15, 2022 · HPAI is a specific type of ‘bird flu’ that can cause serious disease and death in many species of birds. HPAI has long been recognized as an important poultry disease, but it only emerged as a significant source of mortality among wild birds over the past two decades.

To identify the baseline HPAI distribution across U.S. flyways and constituent watersheds and to detect early spread of HPAI to new flyways and regions, sample units were defined geographically using the USGS 4-digit hydrologic unit code (HUC4).

Avian influenzas are classified into two categories: low pathogenic avian influenza (LPAI) and highly pathogenic avian influenza (HPAI). LPAI viruses cause either no signs of disease or mild disease while HPAI can sicken and kill domesticated birds such as chickens, ducks, and turkey.

The purpose of this document is to detail the essential components of a national surveillance system for influenzas of interest in wild, migratory birds in order to provide HPAI infection risk information to domestic poultry producers and to the greater agricultural and USDA community.

Mar 17, 2020 · As of June 2015, the new strains of HPAI have been detected in 3 of the 4 migratory flyways, with no positives yet in the Atlantic flyway; however little sampling has been conducted since the onset of the current HPAI situation.

There have been six virus introductions to date along both Atlantic and Pacific flyway; the majority of the reassortants have emerged with the A1 genotype. Migratory bird GenoFlu genotypes by overall percent, dates of detection, and flyway distribution as of 29 February 2024.

Oct 12, 2022 · Migratory Waterfowl Flyways in the US. Waterfowl and waterbird migration in North America consists of north-south seasonal movements between breeding grounds and wintering areas. The four flyways in North America include the Atlantic, Mississippi, Central, and Pacific.

The genetic footprints of all segments of the viruses, integrating migratory wild bird flyways and our phylogenetic data, provide evidence that the H5N1 HPAI viruses have been introduced to British Columbia likely through two prominent flyways—the East Asia-Australasia/Pacific and the Atlantic flyways.

Jun 6, 2022 · Author summary The recent first detection of highly pathogenic avian influenza (HPAI) virus in wild birds inhabiting the Atlantic Flyway of North America (Newfoundland, Canada in November 2021 and South Carolina, USA, in January 2022) raises concern for virus movement within this region.