Dum Dee Dum... I am not a super hero neither am i spiderman. I am going to save the world... like as if you would believe. I am a maniac. I came from an outer space which is filled with water. I learn swimming at the age of zero.I wail like a cry baby. I crawl like spiderman, i fly like superman, i drive like batman. I live in wonderland. Rugrats is my friend, so is peter pan.
Influenza A virus subtype H1N1, also known as A(H1N1), is a subtype of influenza virus A and the most common cause of influenza (flu) in humans. Some strains of H1N1 are endemic in humans and cause a small fraction of all influenza-like illness and a large fraction of all seasonal influenza. H1N1 strains caused roughly half of all human flu infections in 2006. Other strains of H1N1 are endemic in pigs (swine influenza) and in birds (avian influenza).
In June 2009, WHO declared that flu due to a new strain of swine-origin H1N1 was responsible for the 2009 flu pandemic? This strain is commonly called "swine flu".
Influenza A virus strains are categorized according to two proteins found on the surface of the virus: hem agglutinin (H) and neuraminidase (N). All influenza A viruses contain hem agglutinin and neuraminidase, but the structure 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.
