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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク African swine fever virus ： ウィキペディア英語版 African swine fever virus African swine fever virus (ASFV) is the causative agent of African swine fever (ASF). The virus causes a haemorrhagic fever with high mortality rates in pigs, but persistently infects its natural hosts, warthogs, bushpigs, and soft ticks of the ''Ornithodoros'' genus, with no disease signs. ASFV is a large, double-stranded DNA virus which replicates in the cytoplasm of infected cells, and is the only member of the ''Asfarviridae'' family. ASFV infects domestic pigs, warthogs and bushpigs, as well as soft ticks (''Ornithodoros''), which likely act as a vector.〔 ASFV is the only virus with a double-stranded DNA genome transmitted by arthropods. The virus causes a lethal haemorraghic disease in domestic pigs. Some isolates can cause death of animals within as quickly as a week after infection. In all other species, the virus causes no obvious disease. ASFV is endemic to sub-Saharan Africa and exists in the wild through a cycle of infection between ticks and wild pigs, bushpigs, and warthogs. The disease was first described after European settlers brought pigs into areas endemic with ASFV and, as such, is an example of an 'emerging infection'. ==Signs and symptoms== In the acute form of the disease caused by highly virulent strains, pigs may develop a high fever, but show no other noticeable symptoms for the first few days. They then gradually lose their appetites and become depressed. In white-skinned pigs, the extremities turn blueish-purple and hemorrhages become apparent on the ears and abdomen. Groups of infected pigs lie huddled together shivering, breathing abnormally, and sometimes coughing. If forced to stand, they appear unsteady on their legs. Within a few days of infection, they enter a comatose state and then die. In pregnant sows, spontaneous abortions occur. In milder infections, affected pigs lose weight, becoming thin, and develop signs of pneumonia, skin ulcers, and swollen joints.〔(【引用サイトリンク】url=http://www.thepigsite.com/pighealth/article/441/african-swine-fever-asf )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「African swine fever virus」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.