中国南部の動物からSARSコロナウイルスに関連するウイルスの分離と特徴付け
1Department of Microbiology, The University of Hong Kong, University Pathology Building, Queen Mary Hospital, Hong Kong Special Administrative Region, People's Republic of China. yguan@hkucc.hku.hk
Science (New York, N.Y.)
|September 6, 2003
まとめ
重症急性呼吸器症候群 (SARS) を引き起こす新型コロナウイルスは,中国市場でのシベットや他の動物で発見されました. これは,種間ウイルスのヒトへの感染の経路を示唆しています.
科学分野:
- ウイルス学 ウイルス学 ウイルス学
- 感染症 感染症は感染症です.
- エピデミオロジー エピデミオロジー
背景:
- 新型コロナウイルス (SCoV) は重症急性呼吸器症候群 (SARS) を引き起こします.
- 生きた動物の市場は,動物性感染症の発生の潜在的なハブである.
- SARSの起源を理解することは,公衆衛生にとって非常に重要です.
研究 の 目的:
- SARSの原因となる新型コロナウイルスの発生源と感染経路を特定する.
- 生動物の市場内の動物集団におけるSCoV型ウイルスの存在を調査する.
主な方法:
- 動物とヒトのサンプルからウイルスの分離と識別.
- ウイルスの単離を比較するための遺伝子配列決定.
- 市場環境における疫学調査.
主要な成果:
- SCoV型ウイルスは,広東の市場でのヒマラヤのナツメシベット,ラクオン犬,および人間から隔離されました.
- 動物の単離体は,ほとんどのヒトの単離体には存在しないユニークな29核酸配列を含んでいた.
- 証拠は,市場での動物とヒトの間でウイルスの循環を示唆しました.
結論:
- 野生の生きた哺乳類市場では,SCoV.の種間感染が容易になる.
- シベットや潜在的に他の哺乳類は,SARS-CoV.の貯水池または中間宿主である.
- SARS-CoVの天然貯蔵庫は未定であり,さらなる研究が必要である.
関連する概念動画
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...
01:05Single Nucleotide Polymorphisms-SNPs
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,...
01:29Subviral Agents
Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
01:28Rabies
Rabies is a lethal zoonotic disease caused by a single-stranded, negative-sense RNA virus of the Lyssavirus genus, within the family Rhabdoviridae. Its primary mode of transmission to humans is through bites or saliva-contaminated scratches from infected mammals such as dogs, bats, raccoons, or foxes. Transmission can also occur if infectious saliva contacts abraded skin or intact mucous membranes, including the conjunctiva.Viral Entry and Early ReplicationOnce introduced at the bite or scratch...
01:29Coronavirus
Coronaviruses, including the severe acute respiratory syndrome coronavirus (SARS-CoV), are enveloped viruses characterized by their single-stranded, positive-sense RNA genome and helical nucleocapsid structure. The hallmark of these viruses is their club-shaped spike (S) glycoproteins that protrude from the viral envelope, facilitating attachment to host cells. Typically, coronaviruses infect the upper respiratory tract, often causing mild or asymptomatic disease. However, certain strains like...