A quirk of COVID-19 tests can track the new coronavirus variant

Health officials in the United States may be able to use a fluke of COVID-19 testing to monitor the spread of a more contagious form of the virus, which was identified in the country for the first time this week. The variant is spreading widely across the United Kingdom, and has been found in over a dozen countries so far — including the US.

Experts don’t think the coronavirus variant is more deadly than other forms of the virus, and the vaccines already developed should still protect against the new strain. But the variant does appear to spread more easily, and uncontrolled outbreaks would overwhelm hospitals more quickly.

So far, one US case was detected in a patient with COVID-19 in Colorado. Health officials say that the patient...

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