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Epidemiological Characterization and Genetic Variation of the SARS-CoV-2 Delta Variant in Palestine

机译:巴勒斯坦 SARS-CoV-2 Delta 变体的流行病学特征和遗传变异

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摘要

The emergence of new SARS-CoV-2 variants in Palestine highlights the need for continuous genetic surveillance and accurate screening strategies. This case series study aimed to investigate the geographic distribution and genetic variation of the SARS-CoV-2 Delta Variant in Palestine in August 2021. Samples were collected at random in August 2021 (n = 571) from eight districts in the West Bank, Palestine. All samples were confirmed as positive for COVID-19 by RT-PCR. The samples passed the quality control test and were successfully sequenced using the ARTIC protocol. The Delta Variant was revealed to have four dominant lineages: B.1.617 (19%), AY.122 (18%), AY.106 (17%), and AY.121 (13%). The study revealed eight significant purely spatial clusters (p 0.25) with low to medium gene flow (Nm). Recombination events were minimal between clusters (Rm) and between adjacent sites (Rs). The study confirms the utility of the whole genome sequence as a surveillance system to track the emergence of new SARS-CoV-2 variants for any possible geographical association and the use of genetic variation analysis and haplotype networking to delineate any minimal change or slight deviation in the viral genome from a reference strain.
机译:巴勒斯坦出现新的 SARS-CoV-2 变体凸显了持续基因监测和准确筛查策略的必要性。本病例系列研究旨在调查 2021 年 8 月巴勒斯坦 SARS-CoV-2 Delta 变体的地理分布和遗传变异。样本于 2021 年 8 月从巴勒斯坦约旦河西岸的八个地区随机收集 (n = 571)。所有样本均经 RT-PCR 确认为 COVID-19 阳性。样品通过了质量控制测试,并使用 ARTIC 方案成功测序。Delta 变体被发现有四个主要谱系:B.1.617 (19%)、AY.122 (18%)、AY.106 (17%) 和 AY.121 (13%)。该研究揭示了分布在巴勒斯坦北部和南部的八个重要的纯空间集群 (p 0.25),具有低到中等的基因流 (Nm)。簇之间 (Rm) 和相邻位点之间 (Rs) 之间的重组事件最小。该研究证实了全基因组序列作为监测系统的效用,以跟踪任何可能的地理关联中出现的新 SARS-CoV-2 变体,并使用遗传变异分析和单倍型网络来描述病毒基因组与参考菌株的任何微小变化或轻微偏差。

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