A commonly held theory says that flu virus originates every year in Southeast and Eastern Asia, making this region the source of seasonal flu epidemics in other parts of the world. However, researchers at Duke-NUS Graduate Medical School in Singapore have found that influenza virus in tropical areas isn't the only global source of flu epidemics. The international team of scientists involved in the work found that any one of the urban centers they studied could act as a source for a flu epidemic in any other locality...
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