Swine influenza virus

豬流感 (Swine influenza virus,簡稱為 SIV) 於 2009年 3月底在墨西哥和美國加利福尼亞州、德克薩斯州開始爆發，超過 1千人染病，並且導致 60多人死亡，後來更有不斷蔓延的趨勢。由於未能為所有個案作檢測，所以世界衛生組織把所有個案通稱為疑似流感疾病。而這些個案都有嚴重的疑似流感病徵，甚至肺炎，像墨西哥的更導致死亡。這個新變種流感病毒基因部份來自人類流感病毒，其餘來自豬流感。4月，世界衛生組織和美國疾病及控制中心對於新變種，疑似人傳人的風險及在墨西哥的高致命性都表示十分關注。

Swine influenza virus (referred to as SIV) refers to influenza cases that are caused by Orthomyxoviruses endemic to pig populations. SIV strains isolated to date have been classified either as Influenzavirus C or one of the various subtypes of the genus Influenzavirus A.

Swine flu infects people every year and is found typically in people who have been in contact with pigs, although there have been cases of person-to-person transmission. Symptoms include fever, disorientation, stiffness of the joints, vomiting, and loss of consciousness ending in death. Swine influenza is known to be caused by influenza A subtypes H1N1, H1N2, H3N1, H3N2, and H2N3.

In swine, three influenza A virus subtypes (H1N1, H3N2, and H1N2) are circulating throughout the world.[citation needed] In the United States, the H1N1 subtype was exclusively prevalent among swine populations before 1998; however, since late August 1998, H3N2 subtypes have been isolated from pigs. As of 2004, H3N2 virus isolates in US swine and turkey stocks were triple reassortants, containing genes from human (HA, NA, and PB1), swine (NS, NP, and M), and avian (PB2 and PA) lineages.

Linkage
1. 2009年豬流感爆發 in wiki
2. 2009 H1N1 influenza outbreak in wiki
3. 豬流感 in wiki
4. Swine influenza in wiki