Since October 2022, Mexico has vigorously suppressed H5N1 infection using a combination of depopulation and vaccination despite deficiencies in biosecurity in some smaller egg production and broiler operations.

Shortly after declaring freedom from H5N1 infection, Senasica (equivalent to USDA-APHIS) announced isolation of the virus from a migratory bird on October 4^th as part of a surveillance initiative.

EGG-NEWS has reported on isolation of H5N1 from wild birds in six states ranging from Alaska to Mississippi and involving all four of the migratory flyways. Outbreaks of HPAI in backyard flocks that effectively serve as sentinels confirms widespread shedding of H5N1 virus by waterfowl.  These birds are regarded as the source of recent outbreaks in turkey growing farms in South Dakota, Utah and Minnesota. Accordingly cases of HPAI can be anticipated in Mexico. It will be instructive to ascertain whether any vaccinated flocks become infected and whether surveillance detects virus in clinically normal laying hens.