Covid-19 Virus Variants Mu and Lambda Unlikely to Supplant Delta – The Wall Street Journal

The Delta variant of the Covid-19 virus appears well positioned to maintain its dominance over new variants such as Lambda and Mu, virologists say.

Delta accounts for 99% of new Covid-19 cases in the U.S. and roughly 88% of cases globally, according to data from the Centers for Disease Control and Prevention and Nextstrain, an open-source pathogen-tracking service. Virologists expect Delta to outcompete new variants of the SARS-CoV-2 virus, including Lambda and Mu, in their hunt for people susceptible to Covid-19.

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