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WHO Is Monitoring Another COVID Variant Called ‘Mu’

The World Health Organization says it’s monitoring a new COVID-19 variant that scientists believe could potentially evade protection by either vaccination or natural infection. Dubbed “Mu,” with the scientific label of B.1.621, the mutation has been found in at least 39 countries. It has what the WHO described as a “constellation of mutations” that could bypass current vaccine effectiveness. The agency is monitoring several variants “of concern” that...