Low path H5 Avian Influenza in California commercial duck breeder

April 29, 2019

APHIS and CDFA are conducting a comprehensive epidemiological investigation and have implemented enhanced surveillance and testing related to this finding. Two additional commercial poultry premises associated with the initial premises have been quarantined and sampled for avian influenza virus. Results are pending.
Movement controls and enhanced surveillance are being applied, and the affected premises have been disinfected.

USDA, which reported the outbreak to the World Organisation for Animal Health (OIE) on April 24, is not linking these latest cases to the detection of an H7N3 LPAI virus at five locations in Stanislaus County, California, in September and October of 2018.

During 2018, LPAI viruses of the H7N1 subtype were detected as the result of routine surveillance in a broiler breeder flock in Texas, and at a turkey farm in Missouri, and an H5N2 LPAI virus was found at eight turkey farms in Minnesota in October and November 2018. In all of these cases, however, the disease situation was thought to be resolved.