Influenza type B viruses are not classified by subtype and do not cause pandemics. Different strains of the flu virus mutate over time and replace the older strains. This is why it's important to ...

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." ...

As cases of H5N1, also known as avian flu or bird flu ... systems are expected to use tests that identify seasonal influenza A as a subtype – so if a test comes back positive for influenza ...

“Although the source of exposure to the virus in this case is currently unknown…H5N2 viruses have been ... infection caused by a novel influenza A virus subtype is an event that has the ...

A subtype of bird flu caused by avian influenza A (H5) virus has been spreading worldwide in wild birds with a few outbreaks in poultry, dairy cows and other mammals across the United States ...

In this prospective observational study, immune protection against H5N1 and H7N9 avian influenza ... viruses. 1968-1977 (group 2 [G2]; n = 49; mean age, 48.4 years); likely primed by A(H3N2 ...