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A genomic analysis of more than 45,000 complete SARS-CoV-2 genome sequences was published in this week's Communications Biology, revealing the existence of multiple substrains of the virus in the US, some of which have the potential to become more infectious. In the study, researchers from Michigan State University use SNP calling and other techniques to analyze the SARS-CoV-2 genomes and uncover evidence of four substrains and 11 prevalent missense mutations in the US.

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CNN reports that a US Food and Drug Administration document says Johnson & Johnson's SARS-CoV-2 vaccine meets the requirements to receive an Emergency Use Authorization.

According to BBC News, the global vaccine-sharing initiative has sent its first shipment, which arrived in Ghana this week.

Researchers in France are developing a new, fast test for SARS-CoV-2 that initial testing indicates may be highly accurate, the Guardian says.

In Cell this week: analysis of fitness patterns among SARS-CoV-2 isolates, single-cell transcriptome analysis of immune features in COVID-19, and more.