SARS-CoV-2 Mu variant

COVID-19 pandemic
Part of a series on the

COVID-19 (disease) SARS-CoV-2 (virus) Cases Deaths
Timeline 2019 2020 January responses February responses March responses April responses May responses June responses July responses August responses September responses October responses November responses December responses 2021 January responses February responses March responses April responses May responses June responses July responses August responses September responses October responses November responses December responses 2022 January responses February responses March responses April responses May responses June responses July responses August responses September responses October responses November December 2023
Locations By country and territory Africa Antarctica Asia Europe North America Oceania South America By conveyance Cruise ships Naval ships
International response Endemic phase Evacuations Face masks International aid Origin Lockdowns by country Misinformation by governments Fake treatments Social distancing Software Travel United Nations World Health Organization WTO IP waiver Undercounting of deaths COVID-19 apps Zero-COVID National responses Africa China European Union Germany Ghana India Ireland Netherlands New Zealand Nigeria Philippines Russia Sweden UK government US federal government Vietnam
Medical response Disease testing Breathalyzer Development Drug development Drug repurposing Public health mitigation Vaccines History Research VITT Deployment Authorizations Operation Warp Speed Misinformation and hesitancy US Vaccine card Vaccine passports Current vaccines CoronaVac Covaxin Convidecia Janssen Medigen Moderna Novavax Oxford–AstraZeneca Pfizer–BioNTech Sinopharm BIBP Sputnik V
Variants Variants of concern Alpha Beta Gamma Delta Omicron Other variants Epsilon Zeta Eta Theta Iota Kappa Lambda Mu Cluster 5 Lineage B.1.617
Economic impact and recession Arts and culture Aviation Cannabis Cinema films Disney Fashion Financial markets Food industry Food security Journalism Music Performing arts Retail Shipping Television US sportscasting programs Tourism Video games By country Canada India Ireland Malaysia New Zealand Russia UK US By sport Association football Baseball Basketball Combat sports Cricket Disc golf Gaelic games Gridiron football Ice hockey Motorsport Rugby league
Impacts Long COVID Neurological and psychological symptoms Post-exertional malaise Society African diaspora Indian migrant workers Animals Alzheimer's disease patients Crime Death rates by country Disability Domestic violence Emergency evacuations Education Female Environment Hospitals Language LGBTQ community Long-term care Media coverage Mental health Migration Military Notable deaths Other health issues Popular culture Protests Pregnancy Prisons Religion Catholic Church Hajj Science and technology Social media Strikes Suicides Telehealth Xenophobia and racism Politics Diplomacy Infected leaders Ireland Malaysia New Zealand Russia UK US
COVID-19 portal

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 organization has de-escalated the Mu variant and its subvariants to previously circulating variants of interest.

With outbreaks of the Mu variant reported in South America and Europe since detection, the WHO said the variant has mutations that indicate a risk of resistance to the current vaccines and stressed that further studies are needed to better understand it.

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