巴西SARS-CoV-2的演变和流行传播
Darlan S Candido1,2, Ingra M Claro2,3, Jaqueline G de Jesus2,3
1Department of Zoology, University of Oxford, Oxford, UK.
概括
非药物干预措施 (NPIs) 减少了巴西严重急性呼吸系统综合征冠状病毒2 (SARS-CoV-2) 的传播,但干预措施仍然不足. 病毒通过国际引入和国内旅行广泛传播,凸显了疫情控制的持续挑战.
科学领域:
- 流行病学
- 基因组学
- 数学模型
背景情况:
- 巴西正面临严重急性呼吸道综合征冠状病毒2 (SARS-CoV-2) 的快速蔓延.
- 有限的数据使得对非药物干预措施 (NPIs) 对抗SARS-CoV-2传播的有效性进行评估变得复杂.
- 了解病毒传播动态和进化轨迹对于巴西的公共卫生反应至关重要.
研究的目的:
- 评估NPI对巴西SARS-CoV-2传播的影响.
- 调查巴西境内的SARS-CoV-2血统的起源和传播.
- 评估目前控制疫情的干预措施是否足够.
主要方法:
- 使用移动驱动传输模型来估计NPI对复制数量的影响.
- 测序了427个新的SARS-CoV-2基因组,并分析了地理上具有代表性的基因组数据集.
- 分析病毒的引入,分类分布和空间传播模式.
主要成果:
- 在圣保罗和里约热内卢, NPI 将繁殖数 (R0) 从超过3个减少到1.6个.
- 已发现100多个国际 SARS-CoV-2 引入,其中76%的巴西菌株来自三个欧洲菌株.
- 早期的传播是局部的,但后来从城市中心的出口随着全国旅行而增加.
结论:
- NPIs对降低SARS-CoV-2传播率产生了可测量的影响.
- 在巴西, 多次国际入口和随后的国内传播加剧了疫情的蔓延.
- 目前的干预措施不足以有效控制该国的SARS-CoV-2传播.
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