What is Influenza?? Is a Virus or other?

♦️What is Influenza??
     Is a Virus or other? ♦️

♦️Influenza is a virus that actually has hundreds of different strains. The virus mutates frequently, but the strains are classified into one of three main categories—A, B, or C.acumenias
♦️Influenza A is the group that most commonly causes illness in humans.
♦️All influenza A viruses are further broken down into H and N subtypes. So, any influenza virus that is described as "H#N#" (such as H1N1) is an influenza A virus. Acumenias
♦️There are 16 H subtypes and nine N subtypes, but only three combinations have actually caused highly contagious illness in humans.
♦️Other combinations have been found to infect other species (such as birds and pigs), but they have not caused widespread human infections.
♦️The three combinations that cause almost all outbreaks of the flu in humans are H1N1, H2N2 and H3N2.
♦️Even in these subtypes, the influenza virus can mutate and change each year. For this reason, influenza viruses are also named using:
♦️The host of origin (swine, chicken, etc., or no host if it is of human origin)
The geographical location of origin (Hong Kong, Alberta, etc.)
Strain number Year of discovery (or isolation)
💎Influenza B💎
♦️Influenza B is less common but still causes outbreaks of seasonal flu.
♦️One or two strains of influenza B are included in the seasonal flu vaccine every year to protect people from the strain(s) that researchers believe are most likely to cause illness during the upcoming flu season.
♦️The quadrivalent flu vaccine contains two strains of influenza B but the traditional trivalent flu vaccine only contains one.
♦️Influenza B is not broken down into subtypes like influenza A is, but it is broken down into individual strains.
♦️Typically, two strains of influenza A and one strain of influenza B are included in the seasonal flu vaccine. Quadrivalent flu vaccines contain two strains of influenza A and two strains of influenza B.
♦️Influenza B can cause outbreaks of seasonal flu but they occur less frequently than outbreaks of influenza A.

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