The opportunity to come to a big Halloween party will be born in the country has a dense population and agriculture, such as pigs and chickens, ducks are combined, which is a local epidemic. Epidemiology, but once the population has immunity against the pandemic strain increases until a maximum immunity within 10-30 years and new species arising from a combination of a virus from people and from the animals appear. Cause outbreaks around the world, they were so.
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