Avian influenza viruses can infect both birds and mammals, including pigs, cattle, and cats.
high
epidemiology
Host range of avian influenza viruses
Transmission of avian influenza viruses between humans is extremely rare and human-to-human transmission has not been documented in the United States.
high
descriptive
General epidemiological observation about avian influenza transmission patterns.
Domestic poultry and wild birds are common sources of human exposure to avian influenza viruses.
high
descriptive
Typical exposure pathways for zoonotic transmission of avian influenza to humans.
Coinfection of a person with seasonal influenza and an avian influenza virus can enable genetic reassortment that could produce an avian-derived influenza virus with increased ability to transmit between people.
high
epidemiological
Virological risk from simultaneous infection with different influenza viruses.
Seasonal influenza vaccines do not prevent infection by avian influenza viruses because seasonal vaccines target different influenza virus strains.
high
preventive
Limitation of seasonal influenza vaccination with respect to zoonotic avian strains.