H1N1

H1N1

Influenza A virus subtype H1N1 also known as A (H1N1), is a subtype of Influenza A and the most common cause of influenza (flu) in humans. The letter H refers to hemagglutinin protein and the letter N to neuraminidase protein. This subtype has resulted in changing the various strains, including the Spanish flu (now extinct), moderate strains of human influenza strains endemic swine influenza and many strains found in birds

Variants of H1N1 low pathogenic exist in the wild, causing about half of all infections by influenza in 2006 .

In April 2009, an outbreak of H1N1 has killed more than 100 people in Mexico, and was thought to exist more than 1500 people infected around the world on 26 April 2009. The Centers for Disease Control and Prevention in the United States warned that it was possible that this outbreak would lead to a pandemic. [2]. The official WHO review published in the early morning of May 8, 2009, that does not include the increase of cases in North America, Europe and Latin America, the number of infections was 2384, with 42 deaths