First High Path Avian Influenza (H7N3) detected in South Carolina turkey flock.

April 10, 2020

March 13 - As part of routine surveillance for H5/H7 Avian Influenza, H7N3 low pathogenic AI (LPAI) was detected in a turkey parent and 2 grow-out flocks in Union and Anson counties, North Carolina.
March 24 to April 6 - LPAI H7N3 identified at 3 premises in North Carolina and 1 premises in South Carolina. H7 LPAI was subsequently confirmed in 1 commercial turkey breeder and 4 other turkey meat flocks in North Carolina. All 12 flocks (310,269 birds) have been destroyed and disposal is ongoing.
The most likely source of the LPAI is migratory waterfowl with inter-farm spread from possible defects in biosecurity. The Atlantic flyway extends from Georgia along east coast and over to southern Ontario and Quebec. High path versions of this virus strain caused outbreaks in BC 2004, a case in Sask. 2007 as well as Mexico 2012-2018. HPAI was last detected in the U.S. in 2017.