California's dairy farm outbreaks have spread beyond the Central Valley to the southern part of the state.
The infection also marks the first US case with exposure to backyard poultry, which fits H5N1's global pattern.
Also, the USDA reported more confirmations in cows, poultry, and other mammals and Labcorp announced the launch of its H5 molecular test.
Also, the USDA today confirmed Louisiana's first outbreak in a poultry flock, marking the appearance of the virus in all 50 states.
The Louisiana patient, who was exposed to sick and dead birds with suspected infection, has been hospitalized.
In other developments, federal and state officials report more detections in dairy cows, poultry, and wild birds.
The child tested positive for influenza A, which could indicate a range of viruses, from seasonal flu to avian flu.
Sequencing didn't show any mutations that hint at greater infectivity, transmissibility, or resistance to neuraminidase inhibitors.
H9N2 is known to circulate in poultry in the region, and infections are typically reported in children who experience mild disease.
Arizona's patients were exposed to sick poultry at a large commercial farm in Pinal County.
