Coronavirus has mutated to become far deadlier in Europe than the milder strain that made its way to the US west coast, Chinese study finds
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Researchers in China have found at least 30 strains of the SARS-CoV-2 virus
Some of the deadliest mutations were found in Zhejiang, as well as in Europe
The most severe strains could generated up to 270 times as much viral load
Milder mutations were mostly found in the US, such as in Washington state