一个全球流行病血清型14的肺炎菌转向非疫苗类型
Jinglin Yue1,2, Lei Chen3, Tingzhu Yao1,2
1Biomedical Innovation Center, Beijing Shijitan Hospital, Capital Medical University, Beijing, China.
Microbiology spectrum
|March 31, 2025
概括
肺炎球菌合疫苗 (PCV) 减少了疫苗型细菌,但非疫苗型细菌 (NVT) 增加了. 一种流行菌株的血清型从14到15B转换显示了适应性进化,可能导致未来的流行病.
科学领域:
- 微生物学 微生物学
- 基因组学就是基因组学.
- 流行病学 流行病学
背景情况:
- 在全球范围内,Streptococcus pneumoniae引起肺炎,疫苗类型菌株在PCV引入后减少.
- 非疫苗型 (NVT) S. pneumoniae菌株增加,特别是在鼻运输和疾病发病率方面.
- 血清型切换,涉及cps基因位置的改变,是疫苗有效性的关键问题.
研究的目的:
- 分析S. pneumoniae临床分离物以分析血清型分布,并评估疫苗的有效性.
- 确定多药耐药NVT S.肺炎,重点关注CC876复合体和血清型14克隆.
- 为了研究一个潜在的血清型切换事件从血清型14到15B在流行ST4749菌株.
主要方法:
- 来自中国门儿童医院的166个S. pneumoniae临床分离物的高通量测序.
- 分离物的血清定型,以评估疫苗类型的流行率和识别NVT菌株.
- 基因组分析用于绘制重组位点的地图,并确定涉及血清型切换的遗传元素.
主要成果:
- 观察到NVT S. pneumoniae患病率显著增加,与PCV引入相关.
- 在疫情CC876复合体内识别多药耐药NVT S.肺炎.
- 发现一种血清型15B/ST4749菌株,可能是从血清型14/ST4749的血清型切换引起的,涉及cps位点和comC.
结论:
- 该研究强调了S. pneumoniae在疫苗接种压力下的适应性进化,通过血清型切换证明了这一点.
- 发现的新型NVT菌株 (15B/ST4749) 显示了未来流行病出现的潜力.
- 结果为优化S. pneumoniae预防,控制策略和疫苗部署提供了洞察力.
相关概念视频
Viral Mutations
32.1K
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...
32.1K
Lysogenic Cycle of Bacteriophages
61.5K
In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
61.5K
Viral Recombination
23.1K
Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
23.1K
Cross-reactivity
30.9K
Overview
30.9K


