Although it may cause a less severe reaction than type A flu, it can still be extremely harmful on occasion. Influenza type B viruses are not classified by subtype and do not cause pandemics.

told Salon H5N1 and other avian influenza viruses are a type A influenza virus. "We do need subtype confirmation to make sure it's ‘H5,’ and sub-type testing is not widely accessible." ...

There are 16 different hemagglutinins and nine different neuraminidases, and reassortment of these two antigens determines the influenza A virus subtype (e.g., H1N1 or H3N2). Embedded within the ...

In this prospective observational study, immune protection against H5N1 and H7N9 avian influenza virus (AIV ... likely primed by A(H3N2) subtype clade 2 virus. 1978-1997 (group 3 [G3]; n ...

Current subtypes of influenza A viruses that routinely circulate in people include A(H1N1) and A(H3N2). Flu symptoms usually come on suddenly and can cause mild to severs illness. Flu can ...