2019年至2023年在塞内加尔流通的登革热病毒血清型/基因型的时空分布和分子特性
Idrissa Dieng1, Cheikh Talla2, Mamadou Aliou Barry2
1Arboviruses and Haemorrhagic Fever Viruses Unit, Virology Department, Institut Pasteur de Dakar, Dakar 220, Senegal.
Tropical medicine and infectious disease
|February 23, 2024
概括
在塞内加尔 (2019-2023) 的登革热病毒 (DENV) 分子监测显示了DENV-3的占主导地位和更广泛的地理分布. 血清型1和2在2022年3月之前消失了,这表明血清型更换事件.
科学领域:
- * 病毒学和分子流行病学
- * 公共卫生和传染病
背景情况:
- *登革热病毒 (DENV) 构成了日益严重的全球卫生挑战,非洲的疫情越来越多.
- *自2017年以来,塞内加尔每年都有登革热爆发,但详细的血清型分布数据以前是有限的.
研究的目的:
- *从2019年到2023年在塞内加尔进行DENV血清型的最新分子监测.
- *分析循环DENV血清型及其基因型的时间和空间分布.
- * 调查DENV流行病学和国内传播动态的潜在变化.
主要方法:
- *对疑似DENV阳性样本进行采集和RT-qPCR测试.
- * 对阳性病例的时间和空间映射.
- *通过测序对DENV阳性样本子集的基因分析.
主要成果:
- *观察到DENV-1,DENV-2和DENV-3的同时循环,其中DENV-3占主导地位.
- * DENV-1和DENV-2的流通量很少,到2022年3月,它们将完全消失,只剩下DENV-3.
- * 遗传学分析证实了已知的基因型,但在DENV-1, -2,和 -3中发现了新的分类,表明复杂的传播模式.
结论:
- *DENV-3已经取代了其他血清型,并在塞内加尔扩大了其地理分布.
- * 在DENV血型中出现了新的类型,因此需要进一步研究它们的流行病学影响.
- *基因组监测对于理解DENV动态至关重要,需要进一步研究病毒适应性和传播模式.
相关概念视频
00:57Viral Recombination
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.
00:36Viral Mutations
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 for adaptive...
01:28Infectious Diseases and Their Occurrence
Infectious diseases appear in populations through various transmission patterns, influenced by pathogen characteristics, population immunity, environmental conditions, and social behavior. Understanding these patterns is essential for effective public health surveillance and intervention. These categories—sporadic, outbreak, epidemic, pandemic, and endemic—help frame the nature and scope of disease events.Sporadic diseases occur irregularly and infrequently, without a predictable temporal or...
01:23Investigation of Disease Outbreaks
Multistate foodborne outbreaks pose significant public health risks and require meticulous investigation to identify sources and implement control measures. The Centers for Disease Control and Prevention (CDC) utilizes a dynamic seven-step process for these investigations, integrating data from laboratories, interviews, and environmental assessments to protect public health.Outbreak Detection: The detection of multistate outbreaks typically begins with PulseNet, the CDC's national laboratory...
01:25Hepatitis
Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver. The...
01:29Malaria
Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...