Influenza (or flu) is a common respiratory infection caused by a group of ... on the viral surface called hemagglutinin (H) and neuraminidase (N) and these are defined by different numbers ...

And although neuraminidase inhibitors are effective ... Asian lineage avian influenza A (H7N9) virus and two additional respiratory viruses that cause serious illness and depend on SA to infect ...

Influenza, commonly known as the flu is a contagious respiratory infection ... hemagglutinin (H), which helps the virus enter cells, and neuraminidase (N), which helps the virus spread to other ...

Antigenic shift occurs when the surface hemagglutinin and neuraminidase segments ... In humans, influenza virus infection is usually limited to the upper respiratory tract. In certain severe ...