COVID-19大流行 - 变种尾酒,来自北印度的一项研究
Preeti Chaudhary1, Neelam Gulati1, Varsha Gupta1
1Department of Microbiology, Government Medical College and Hospital, Chandigarh, India.
Journal of family medicine and primary care
|July 19, 2024
概括
监测SARS-CoV-2变种,如三角形和Omicron对于公共卫生至关重要. 这项研究跟踪了循环的菌株,并指出了三角洲菌株.
科学领域:
- 病毒学和基因组学
- 流行病学 流行病学
- 公共卫生监督 公共卫生监督
背景情况:
- 严重急性呼吸道综合征冠状病毒2 (SARS-CoV-2) 演变,导致具有不同传染性和死亡率的新变种.
- 基因组监测对于跟踪病毒演变和告知公共卫生反应至关重要.
- 以前的关注变种 (VOCs),如阿尔法,卡帕,三角洲和Omicron,已经显著影响全球健康.
研究的目的:
- 为了识别和监测循环的严重急性呼吸系统综合征冠状病毒2 (SARS-CoV-2) 菌株.
- 通过实时变异信息更新国家和国际基因组监测数据.
- 分析主要的SARS-CoV-2变种的流行病学特征.
主要方法:
- 使用逆转录-聚合酶链反应 (RT-PCR) 处理鼻和口的拭片.
- 积极样本的全基因组测序 (WGS) 使用牛津纳米孔测序技术.
- 生物信息分析用于分类分配 (Nextclade) 和统计分析 (OpenEpi).
主要成果:
- 流通的变种包括阿尔法,卡帕,三角形和Omicron.
- 2021年,三角洲变种占主导地位,而2022年,欧米克朗变种占主导地位.
- 无症状病例占德尔塔和Omicron的阳性病例的30-40%. "三角洲"感染与更高的ICU入院率和死亡率有关,而Omicron病例显示出更高的疫苗接种和旅行史.
结论:
- 持续跟踪SARS-CoV-2变种对于公共卫生至关重要.
- 变种监测可以及时干预,以控制疾病传播.
- 基因组数据为流行病的准备和应对策略提供了前性.
相关概念视频
01:05Single Nucleotide Polymorphisms-SNPs
15.0K
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
15.0K
00:36Viral Mutations
32.2K
A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
32.2K