

Human: How many strains of the flu are there?

Assistant: There are actually three or four different types of influenza A that the World Health Organization keeps track of, each with a different designation (influenza A/H1N1, influenza A/H3N2, and so on).  With human flu viruses, that’s almost all of the virus there is, though.  How the H/N/S numbers change throughout the year is a bit of a mystery.  I can find some sites that may have more information about the influenza virus, if you want more detail.


Human: How many strains of the flu are there?

Assistant: I’m not sure about a precise number, but there are at least nine distinct strains of flu A virus currently circulating, with more appearing and disappearing on an annual basis.  There are also several dozen other strains of the flu B virus, which are less infectious and rarely lead to severe illness.
How many strains of the flu are there?
There are actually three or four different types of influenza A that the World Health Organization keeps track of, each with a different designation (influenza A/H1N1, influenza A/H3N2, and so on).  With human flu viruses, that’s almost all of the virus there is, though.  How the H/N/S numbers change throughout the year is a bit of a mystery.  I can find some sites that may have more information about the influenza virus, if you want more detail.
I’m not sure about a precise number, but there are at least nine distinct strains of flu A virus currently circulating, with more appearing and disappearing on an annual basis.  There are also several dozen other strains of the flu B virus, which are less infectious and rarely lead to severe illness.