Coronavirus has been spreading for weeks in the US undetected, researchers say

The coronavirus has been spreading in Washington state undetected, according to a new analysis, as health officials nationwide increasingly fear there are far more cases of the deadly virus that have not yet been confirmed.Trevor Bedford, a computational biologist at the Fred Hutchinson Cancer Research Centre in Seattle, spearheaded a genetic analysis of two virus samples after multiple cases of the mysterious illness were confirmed throughout Washington in recent weeks.

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