Background While human cases of highly pathogenic avian influenza A (H5N1) virus
infection continue to increase globally, available clinical data on H5N1 cases are limited. We …

Avian influenza virus (H5N1) emerged in Hong Kong in 1997, causing severe human
disease. In recent years, several outbreaks have been reported in different parts of Asia …

Background Widespread infections of avian species with avian influenza H5N1 virus and its
limited spread to humans suggest that the virus has the potential to cause a human …

Avian influenza virus H5N1, which has been limited to poultry, now has spread to migrating
birds and has emerged in mammals and among the human population. It presents a distinct …

In March 2013 the first cases of human avian influenza A (H7N9) were reported to the World
Health Organization. Since that time, over 650 cases have been reported. Infections are …

Pandemic influenza virus has its origins in avian influenza viruses. The highly pathogenic
avian influenza virus subtype H5N1 is already panzootic in poultry, with attendant economic …

Background and objectives Severe infection with avian influenza A (H5N6) virus in humans
was identified first in 2014 in China. Before that, it was unknown or unclear if the disease or …

Avian influenza A (H9N2) virus is transmitted sporadically from avian species to human
causing mild diseases in immunocompetent person. We report two immunocompromised …

Background Human infections with different avian influenza viruses—eg, H5N1, H9N2, and
H7N9—have raised concerns about pandemic potential worldwide. We report the first …

The establishment and spread of highly pathogenic avian influenza (HPAI) viruses of the
H5N1 subtype in birds and coincident infections in humans since 2003 have raised …