SARS-CoV-2 Mu variant

COVID-19 pandemic
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The Mu variant (B.1.621) is a variant of SARS-CoV-2. It was first detected in Colombia in January 2021 and was classified by the World Health Organization (WHO) as a variant of interest on August 30, 2021. On March 9, 2022, the WHO de-escalated the Mu variant and its subvariants to previously circulating variants of interest.

The B.1.621 lineage has a sublineage, designated B.1.621.1 under the PANGOLIN nomenclature, which has also been detected in multiple countries worldwide.