The first known fatal case of avian flu was reported Monday in Louisiana, while California is battling a major outbreak of the virus in its dairy cattle herds.
Seven poultry farms near London, Ontario are under quarantine due to an avian flu outbreak. The virus could have been brought into the area from water fowl.
The CDC says the risk of bird flu to the general public is low, but public health experts say they are worried the virus could mutate and become more transmissible.