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In March and April 2009, hundreds of laboratory-confirmed infections and a number of deaths were caused by an outbreak of a new strain of H1N1. Influenza A virus subtype H1N1, also known as A(H1N1), is a subtype of influenzavirus A and the most common cause of influenza (flu) in humans. Some strains of H1N1 are endemic in humans, including the strain(s) responsible for the 1918 flu pandemic which killed 50–100 million people worldwide. Less virulent H1N1 strains still exist in the wild today, worldwide, causing a small fraction of all influenza-like illness and a large fraction of all seasonal influenza. H1N1 strains caused roughly half of all flu infections in 2006. Other strains of H1N1 are endemic in pigs and in birds.(infos from wikipedia.com) French version: H1N1 désigne un ensemble de virus de la grippe appartenant à la même lignée de type A, sous-type H1N1. Ils sont caractérisés par un pouvoir pathogène élevé pour l'Homme.Le nom H1N1 indique que le virus présente à sa surface la combinaison de deux molécules-antigènes: l’hémagglutinine de type 1 ; la neuraminidase de type 1.(infos de wikipedia.com) by http://www.flu-h1n1-virus.com/
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