Asia, the cradle of influenza

International researchers suggest that new varieties of flu are emerging in Asia and completed his cycle in Latin America, after traveling almost simultaneously in Europe and North America. And is that the virus is developing so fast that different strains circulate every winter. When it seems, China is the main source of the most common type of influenza. Some varieties of the virus prefer the rainy season in tropical countries, but in more temperate zones prevail in a cold climate.