Genomic surveillance of SARS-CoV-2 reveals how the pandemic was caused in Africa

A genomic surveillance analysis of SARS-CoV-2 in Africa in the first year of the pandemic reveals that the first phase of the pandemic there was caused by importations from outside Africa, and involved limited virus spread, while the second, more deadly phase was fueled by ongoing transmission within the continent and led to emergence of many variants of concern.

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