In other animal developments, outbreaks were detected on several more California poultry and dairy farms, and Arizona reported its first in commercial poultry.
The patient from Oregon had been exposed to sick poultry during an outbreak that occurred toward the end of October.
In other developments, Alveo Technologies announced an agreement with the CDC to develop a rapid multiplex test for point-of-need use.
Sequencing shows that the virus is similar to the type infecting British Columbia poultry, as H5N1 strikes more large poultry farms in the western US.
Hawaii is the only US state that hasn't reported H5N1 avian flu in birds or animals.
The teen was previously healthy and didn't have any links to farms or poultry.
The patients are from 4 different provinces, and all but one is a child.
The 2023 outbreak showed H5N1 spread efficiently among marine mammals.
The presumed positive infection comes amid a rise in poultry outbreaks in BC and US western states, likely triggered by wild bird migration.
The CDC now recommends testing and prophylactic Tamiflu use in asymptomatic workers exposed to sick animals.
