The flu is spreading far and wide across the U.S. – and influenza A is largely to blame. Of all the flu tests reported to the ...

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 ...

Flu A and flu B are two different strains of influenza, explains Thomas Russo, M.D., professor and chief of infectious ...

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 ...

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 ...

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 ...

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 ...