Influenza, commonly called flu, is an infection of the respiratory tract that affects the nose, throat and the lungs.
It constitutes a major threat to public health, claiming between ¼ and ½ million lives a year.
Flu epidemics are seasonal outbreaks. In the Northern Hemisphere they occur between late autumn and early spring. Two or three different strains of influenza may circulate during the winter months of the Northern and Southern hemispheres, and throughout the year in Equatorial countries.
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Flu pandemics occur at any time of year and affect populations in all parts of the world. Pandemics occur when a new influenza A virus emerges, with no existing antibodies to the virus anywhere in the world. Because so many people are infected during a pandemic, millions of severe and fatal illnesses usually occur.
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The influenza A (H1N1) virus is a new virus subtype of influenza affecting humans, which results of a combination of two swine influenza viruses that contained genes of avian and human origin. >> To learn more about Influenza A(H1N1) virus