1. CDC. COVID-19: SARS-CoV-2 variant classifications and definitions. Atlanta, GA: US Department of Health and Human Services, CDC; 2021. https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/variant-surveillance/variant-info.html
2. Public Health England. SARS-CoV-2 variants of concern and variants under investigation in England—technical briefing 17. London, United Kingdom: Public Health England; 2021. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/997418/Variants_of_Concern_VOC_Technical_Briefing_17.pdf
3. Illumina. Illumina COVIDSeq test instructions for use. Silver Spring, MD: US Department of Health and Human Services, Food and Drug Administration; 2020. Accessed June 4, 2021. https://www.fda.gov/media/138776/download
4. Public Health England. SARS-CoV-2 variants of concern and variants under investigation in England—technical briefing 13. London, United Kingdom: Public Health England; 2021. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/990339/Variants_of_Concern_VOC_Technical_Briefing_13_England.pdf
5. Multiple COVID-19 outbreaks linked to a wedding reception in rural Maine—August 7–September 14, 2020.;Mahale;MMWR Morb Mortal Wkly Rep,2020