article · Science
An analysis of genomic epidemiology across 33 African countries and two overseas territories, examining 8,746 SARS-CoV-2 genomes, traces how the pandemic developed across the continent over a year. Initial viral introductions into most African nations originated primarily from Europe. These early importations declined following the prompt enforcement of international travel limits. Over time, persistent local transmission combined with rising internal mobility fostered the emergence and dissemination of multiple variants of concern and interest, including B.1.351, B.1.525, A.23.1, and C.1.1. Although genomic surveillance faced constraints such as limited sample sizes and regional blind spots, the patterns demonstrate the dynamic internal spread of the virus. The observations emphasise the necessity of integrating Africa fully into global response mechanisms to curb the potential generation and export of emerging variants.
Tracking the spread and mutation of viruses informs border control policies, targeted healthcare measures, and global vaccine deployment. Demonstrating how travel restrictions and local mobility shape viral evolution helps international health bodies allocate surveillance resources equitably, ensuring that emerging variants are detected early before spreading worldwide.
The abstract does not indicate an application pathway, focusing instead on public health observations and genomic epidemiology.
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The progression of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic in Africa has so far been heterogeneous, and the full impact is not yet well understood. In this study, we describe the genomic epidemiology using a dataset of 8746 genomes from 33 African countries and two overseas territories. We show that the epidemics in most countries were initiated by importations predominantly from Europe, which diminished after the early introduction of international travel restrictions. As the pandemic progressed, ongoing transmission in many countries and increasing mobility led to the emergence and spread within the continent of many variants of concern and interest, such as B.1.351, B.1.525, A.23.1, and C.1.1. Although distorted by low sampling numbers and blind spots, the findings highlight that Africa must not be left behind in the global pandemic response, otherwise it could become a source for new variants.
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DOI: 10.1126/science.abj4336
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