H1N1

This week my school have to be closed due to H1N1 virus which have spreaded and infected some of my students. What is H1N1 actually?is it a flu followed by high fever?Then i google thru the net n i found this ;

"Influenza A virus strains are categorized according to two proteins found on the surface of the virus: hemagglutinin (H) and neuraminidase (N). All influenza A viruses contain hemagglutinin and neuraminidase, but the structures of these proteins differ from strain to strain, due to rapid genetic mutation in the viral genome.

Influenza A virus strains are assigned an H number and an N number based on which forms of these two proteins the strain contains. There are 16 H and 9 N subtypes known in birds, but only H 1, 2 and 3, and N 1 and 2 are commonly found in humans"

Got it?Understand it?

Well, i'm not quit sure about this either but i can conclude that the flu is always in our system....but if we are infected by this virus, it will mutated in our system n becomes another flu virus...n if our body immune is not able to protect our body system to this virus, then it may kills the home human.