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MMWR Morb Mortal Wkly Rep. 2021 Sep 10;70(36):1255-1260. doi: 10.15585/mmwr.mm7036e2. MMWR Morb Mortal Wkly Rep. 2021. PMID: 34499627 . Nature. 2021 Sep;597(7877):561-565. doi: 10.1038/s41586-021-03887-4. Epub 2021 Sep 8. Nature. 2021. PMID: 34497418