出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2016/02/02 00:15:08」(JST)
Mumps virus | |
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TEM micrograph of the mumps virus. | |
Virus classification | |
Group: | Group V ((-)ssRNA) |
Order: | Mononegavirales |
Family: | Paramyxoviridae |
Genus: | Rubulavirus |
Type species | |
Mumps virus |
Mumps virus is the causative agent of mumps, a well-known common childhood disease characterised by swelling of the parotid glands, salivary glands and other epithelial tissues, causing high morbidity and in some cases more serious complications such as deafness. Natural infection is currently restricted to humans and the virus is transmitted by direct contact, droplet spread, or contaminated objects.
It is considered a vaccine-preventable disease, although significant outbreaks have occurred in recent years in developed countries such as America, in areas of poor vaccine uptake. These have allowed the further evaluation and ennumeration of its efficacy (~75–85% after two doses of MMR).[1]
The mumps virus belongs to the genus Rubulavirus in the family Paramyxovirus and is seen to have a roughly spherical, enveloped morphology of about 200 nm in diameter.[2] It contains a linear, single-stranded molecule of negative-sense RNA 15,384 nucleotides long.[2]
The mumps virus is a roughly spherical particle made up of concentric layers of fatty lipids, large protein molecules, and nucleic acid. It is dotted with large 'spikes' made up of protein that enable it to gain entry to host cells. Inside lies a core of a single, long molecule of RNA wrapped up in protein that is released into the cell.
Electron microscopy (EM) revealed that the mumps virus (MuV), like other members of the Paramyxoviridae, has an enveloped virion of roughly spherical or pleiomorphic (variable) shape.[2] Paramyxovirus particles can have sizes ranging from 120–450 nm in diameter.
These particles consist of what is known as a ribonucleoprotein (RNP) complex: a single-stranded, linear RNA genome coated by nucleocapsid proteins (NP) in association with an RNA polymerase complex of both large (L) and phosphoprotein (P) subunits. It has been estimated that over 2,000 such NP molecules coat the genome along with about 250 P and 25 L molecules.
This RNP structure interacts with the viral envelope via matrix (M) proteins that are evenly distributed around the virion. The envelope, a lipid bilayer derived from the host-cell plasma membrane, harbours multiple copies of a number of glycoproteins required for virus entry and exit: hemagglutinin-neuraminidase (HN), fusion (F), and the small hydrophobic (SH) protein.
This molecular assembly of protein, RNA, and lipids allows a single virus to bind to and infect specific cells and replicate itself and finally exit the cell to be transmitted to the next susceptible host.
Although there is only one serotype of the mumps virus, according to recent update by WHO (June 2012), there are currently 12 genotypes A-N, (namely A, B, C, D, F, G, H, I, J, K, L, N) excluding (E and M). L-Zagreb vaccine strain comes under genotype N. The typing scheme is based on the sequence of the small hydrophobic (SH) gene.
There are several subgenotypes (D1, D2 G1, G2, H1, H2) which are designated by numerals after the letter. G2 is the current subgenotype circulating in the Indian subcontinent.[3]
Among vaccine strains, Jerryl Lynn and Rubini belong to genotype A, Urabe is genotype B. It is not clear yet if there is any clinical significance to the genotypes.
The mumps virus can infect ependymal cells in the central nervous system.[4]
Several strains are used to vaccinate against mumps. These include the strains Jerryl Lynn, L-Zagreb, Leningrad-3 and Rubini and Urabe.
Universal mumps vaccination was introduced in the United Kingdom in 1988.
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リンク元 | 「ワクチン」「パラミクソウイルス科」「ムンプスウイルス」「おたふく風邪ウイルス」「流行性耳下腺炎ウイルス」 |
関連記事 | 「mumps」「virus」 |
病原体 | 感染症 | ワクチン | 学校伝染病 | ワクチンの形状 | 潜伏期間 | 季節性 | 年齢 | 出席停止解除条件 | |
ジフテリア菌 | Corynebacterium diphtheriae | ジフテリア | ジフテリア,破傷風,百目咳混合ワクチン | トキソイド | |||||
百日咳菌 | Bordetella pertussis | 百日咳 | ○ | 不活化 | 6~14 | 咳の消失 | |||
結核菌 | Mycobacterium tuberculosis | 結核 | BCG | ○ | 不活化 | 伝染のおそれが無くなるまで | |||
ポリオウイルス | poliovirus | ポリオ | ポリオワクチン(経口) | 生 | |||||
麻疹ウイルス | measles virus | 麻疹 | 麻疹・風疹混合ワクチン | ○ | 生 | 10~12 | 0~2 | 解熱後3日 | |
風疹ウイルス | rubella virus | 風疹 | ○ | 生 | 18 | 春~初夏 | 4~9 | 発疹消失 | |
日本脳炎ウイルス | Japanese encephalitis virus | 日本脳炎 | 日本脳炎ワクチン | 不活化 | |||||
インフルエンザウイルス | influenza virus | インフルエンザ | インフルエンザワクチン | ○ | 不活化 | 1~5 | 冬期 | 解熱後2日 | |
インフルエンザ菌 | Haemophilus influenzae | 化膿性髄膜炎など | Hibワクチン | ||||||
肺炎球菌 | Streptococcus pneumoniae | ||||||||
水痘・帯状疱疹ウイルス | varicella zoster virus | 水痘 | ○ | 生 | 11~21 | 冬(12, 1) | 5~9 | 発疹の痂皮化 | |
ムンプスウイルス | mumps virus | 流行性耳下腺炎 | ○ | 生 | 18~21 | 耳下腺腫脹消失 | |||
B型肝炎ウイルス | hepatitis B virus | B型肝炎 | 成分 | 60~160 | |||||
A型肝炎ウイルス | hepatitis A virus | A型肝炎 | 不活化 | 15~40 | |||||
狂犬病ウイルス | rabies virus | 狂犬病 | 不活化 | ||||||
アデノウイルス | adenovirus | 咽頭結膜熱 | ○ | ||||||
黄熱病ウイルス | yellow fever virus | 黄熱病 | 生 |
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