Low pathogenic avian influenza A (LPAI) outbreaks*

Based on the World Organization for Animal Health (OIE) reporting criteria for avian influenza in commercial poultry, since 1997, the United States has experienced sporadic incidents of LPAI (H5 or H7).

For more information about LPAI (H5 or H7) outbreaks that have been reported in North America (including the U.S.) and around the world since January 2005, visit the OIE’s World Animal Health Information Database (WAHID). For more information about LPAI (H5 or H7) outbreaks that have been reported in North America (including the U.S.) and around the world prior to January 2005, visit the OIE’s WAHID Handistatus II.

Highly pathogenic avian influenza A (HPAI) outbreaks*

From 1997 to 2016, outbreaks of HPAI (H5) viruses in commercial poultry were reported to the OIE. This does not include any outbreaks which may have been reported in 2017.

H5N2 in Texas, 2004

In February 2004, an outbreak of HPAI (H5N2) virus was reported in a flock of 7,000 chickens in south-central Texas. At that time, this was the first outbreak of HPAI in the United States in 20 years.^1,2 No transmission of HPAI (H5N2) virus to humans was reported.

H5 Outbreaks, 2014-2015

Beginning in January 2015 to June 2015, HPAI (H5) virus outbreaks were reported in commercial poultry flocks in 21 U.S. states and Canada. HPAI viruses also were detected in captive and wild birds in 2014 and 2015 in the U.S. and Canada. No transmission of HPAI (H5) virus to humans was reported.

More information about H5 outbreaks in birds and poultry in the U.S. during 2014-2015 is available at H5 Viruses in the United States.

H7N8 in Indiana, 2016

In January 2016, an outbreak of HPAI (H7N8) virus was reported in a commercial turkey flock in Dubois County, Indiana. LPAI (H7N8) was subsequently detected in eight nearby turkey flocks. No transmission of HPAI (H7N8) or LPAI (H7N8) virus to humans was reported. More information is available at Avian Influenza H7N8 Update.