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Discovering new viruses has historically been biased towards people and animals that exhibit symptoms of disease – like a cough, fever or skin blister. But there are two challenges to discovering viruses this way. The first is that it’s only the beginning of a long and painstaking process of identifying the infectious virus that caused it. The second more important reason is that it leaves out potentially deadly viruses that might emerge as a result of transmission from other species where they don’t show any clear signs of infection. Read more