Every time there is a major disease outbreak, one of the first questions scientists and the public ask is “Where did this come from?” How Virus Detectives Trace the Origins of an Outbreak, and Why It s So Tricky.
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Hee-Chan Hwang - Plötzlich Pokalheld | Sport | DW dw.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from dw.com Daily Mail and Mail on Sunday newspapers.