Phylogenetic estimates of SARS-CoV-2 introductions into Washington State.

Phylogenetic estimates of SARS-CoV-2 introductions into Washington State.
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DOI:
10.1016/j.lana.2021.100018
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发表时间:
2021-09
期刊:
Lancet regional health. Americas
影响因子:
--
通讯作者:
Herbeck JT
Herbeck JT
中科院分区:
其他
文献类型:
--
作者:
Tordoff DM;Greninger AL;Roychoudhury P;Shrestha L;Xie H;Jerome KR;Breit N;Huang ML;Famulare M;Herbeck JT

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2020年1月21日,华盛顿州发现了北美首例SARS-CoV-2确诊病例。我们的目的是量化州外传入华盛顿的SARS-CoV-2的数量和时间趋势。我们对2019年12月至2020年9月期间从GISAID采样的11,422个公开可用的全基因组SARS-CoV-2序列进行了分子流行病学分析。我们使用最大简约祖先状态重建方法对时间校准的遗传学,列举引进/出口,他们可能的地理来源(美国,非美国,东部和西部之间的华盛顿),并估计引进日期。为了将系统发育不确定性纳入我们的估计,我们通过生成25个随机时间分层的非华盛顿参考序列样本、20个随机多分割分辨率和10个重建祖先状态的随机分辨率进行了5,000次重复分析。我们估计至少有287个引入(范围244-320)到华盛顿和204个输出谱系(范围188-227)的SARS-CoV-2的华盛顿。介绍开始于1月中旬,并于2020年3月29日达到顶峰。具有Spike D 614 G变体的谱系占引入的大多数(88%)。总体而言,华盛顿的61%(范围55-65%)可能来自美国其他地方,而其余39%(范围35-45%)可能来自美国以外。州内传播分别占华盛顿东部和西部的65%和28%。华盛顿的SARS-CoV-2疫情是由大量的引进不断播种的。我们的研究结果强调了基因组监测的重要性,以监测由于SARS-CoV-2的高水平州际和州内传播而出现的变异。没有。
The first confirmed case of SARS-CoV-2 in North America was identified in Washington state on January 21, 2020. We aimed to quantify the number and temporal trends of out-of-state introductions of SARS-CoV-2 into Washington. We conducted a molecular epidemiologic analysis of 11,422 publicly available whole genome SARS-CoV-2 sequences from GISAID sampled between December 2019 and September 2020. We used maximum parsimony ancestral state reconstruction methods on time-calibrated phylogenies to enumerate introductions/exports, their likely geographic source (US, non-US, and between eastern and western Washington), and estimated date of introduction. To incorporate phylogenetic uncertainty into our estimates, we conducted 5,000 replicate analyses by generating 25 random time-stratified samples of non-Washington reference sequences, 20 random polytomy resolutions, and 10 random resolutions of the reconstructed ancestral state. We estimated a minimum 287 introductions (range 244-320) into Washington and 204 exported lineages (range 188-227) of SARS-CoV-2 out of Washington. Introductions began in mid-January and peaked on March 29, 2020. Lineages with the Spike D614G variant accounted for the majority (88%) of introductions. Overall, 61% (range 55-65%) of introductions into Washington likely originated from a source elsewhere within the US, while the remaining 39% (range 35-45%) likely originated from outside of the US. Intra-state transmission accounted for 65% and 28% of introductions into eastern and western Washington, respectively. The SARS-CoV-2 epidemic in Washington was continually seeded by a large number of introductions. Our findings highlight the importance of genomic surveillance to monitor for emerging variants due to high levels of inter- and intra-state transmission of SARS-CoV-2. None.
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