PHILADELPHIA - The World Health Organization has identified the COVID-19 mu strain as a "variant of interest." Health officials are keeping an eye on the new strain to see if it becomes dominant.
WHO defines variants of interest as COVID-19 strains that have the potential to affect the virus' transmissibility and disease severity.
They could also be responsible for outbreaks in multiple countries over time. "The Mu variant has a constellation of mutations that indicate potential properties of immune escape.