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Influenza virus strains that cause seasonal flu in temperate climates may emerge anew from tropical regions each year, according to a new study. Understanding how flu viruses evolve and spread is essential for making more effective future flu vaccines. Influenza A viruses, seen with an electron microscope. Image courtesy of Wellcome Library, London. Each year, influenza is estimated to cause 250,000 to 500,000 deaths worldwide, according to the World Health Organization. Influenza type A, the most potent version of the virus, is responsible for seasonal epidemics in temperate climates during winter months. jackpot the pimp part two lyricss free online casino slot tournments video slots fun casino birthday party games best free casino bonus
