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Google security researcher Neel Mehta pointed out similarities between WannaCry and malware used by Lazarus, the group that has been blamed for the Sony Pictures hack of 2014.
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Most tests for viruses aim to detect only one or two. But researchers can now check a drop of blood for antibodies to hundreds of viruses, tracing the history of a lifetime of infections, old and new.
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While some Americans worried that Ebola would spread around the U.S., a new mosquito-borne virus flew right in. It sickened more than 2,000 Americans and nearly a million people across the Caribbean.
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Public health has a way of slipping off the radar when people aren't scared about Ebola or anthrax. But that doesn't mean the threats go away. And most states aren't prepared for the next one.