牛インフルエンザH5N1ウイルスの病原性と伝染性
Amie J Eisfeld1, Asim Biswas1, Lizheng Guan1
1Influenza Research Institute, Department of Pathobiological Sciences, University of Wisconsin-Madison, Madison, WI, USA.
Nature
|July 8, 2024
まとめ
高病原性H5N1鳥インフルエンザ (HPAI H5N1) は,公衆の健康に危険をもたらす. この研究は,牛のH5N1ウイルスが哺乳類に感染し,伝播する可能性があることを示しており,さらなる調査が必要である.
科学分野:
- ウイルス学
- 感染症
- 公衆衛生
背景:
- 高病原性H5N1鳥インフルエンザ (HPAI H5N1) は哺乳類では滅多に伝染しない.
- 2024年に米国におけるHPAI H5N1の発生は,ヒトへの感染と動物への感染による公衆衛生上の懸念を高めた.
研究 の 目的:
- 感染した牛乳から分離されたHPAI H5N1ウイルスを特徴付けるため
- 哺乳類におけるこの牛のH5N1ウイルスの感染と感染の可能性を評価する.
主な方法:
- ネズミやフレットに牛のH5N1ウイルスの感染
- 乳腺を含む全身の拡散分析
- 人間の呼吸道へのシアル酸の結合の評価
- フレットでの伝播研究
主要な成果:
- 牛のH5N1ウイルスは,乳腺を含むマウスやフレットに全身的に広がった.
- ウイルスは人間の上部呼吸道でシアル酸に結合します.
- フェレットへの非効率的な感染が観察され,感染した4匹のフェレットのうち1匹が検出可能なウイルスなしで血清変換した.
結論:
- 牛のH5N1ウイルスは,古いHPAI H5N1株に似た乳腺のトロピズムを示しています.
- このウイルスは,哺乳類の感染と伝播の可能性を示唆する特性を有しています.
- この結果は,HPAI H5N1に関連した公衆衛生上のリスクの進化を強調しています.
さらに関連する動画
08:10Production of High-Titer Infectious Influenza Pseudotyped Particles with Envelope Glycoproteins from Highly Pathogenic H5N1 and Avian H7N9 Viruses
Published on: January 15, 2020
8.3K
12:18Expression of Functional Recombinant Hemagglutinin and Neuraminidase Proteins from the Novel H7N9 Influenza Virus Using the Baculovirus Expression System
Published on: November 6, 2013
24.1K
関連する概念動画
00:57Viral Recombination
23.4K
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.
23.4K
02:28Leaky Scanning
5.1K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.1K
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
01:20Infection
7.8K
When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
7.8K