现在有多少种猪流感病毒？中英文对照阅读

第页共页如今有多少种猪流感病毒？中英文对照阅读如今有多少种猪流感病毒？中英文对照阅读SwineFluWhatisSwineInfluenza?SwineInfluenza(swineflu)isarespiratorydiseaseofpigscausedbytypeAinfluenzavirusthatregularlycausesoutbreaksofinfluenzainpigs.Swinefluvirusescausehighlevelsofillnessandlowdeathratesinpigs.Swineinfluenzavirusesmaycirculateamongswinethroughouttheyear,butmostoutbreaksoccurduringthelatefallandwintermonthssimilartooutbreaksinhumans.Theclassicalswinefluvirus(aninfluenzatypeAH1N1virus)wasfirstisolatedfromapigin1930.什么是猪流感？猪流感(SwineInfluenza,swineflu)是猪的一种呼吸道疾病，它的病原是一种能造成周期性爆发的A型流感病毒。猪流感病毒的致病率很高，但猪的死亡率低。猪流感病毒在全年都有可能传播，但大局部会在深秋和冬季月份爆发，这一点与人流感类似。典型的猪流感病毒(A型H1N1病毒)于1930年第一次从猪身上别离出来。Howmanyswinefluvirusesarethere?Likeallinfluenzaviruses,swinefluviruseschangeconstantly.Pigscanbeinfectedbyavianinfluenzaandhumaninfluenzavirusesaswellasswineinfluenzaviruses.Wheninfluenzavirusesfromdifferentspeciesinfectpigs,thevirusescanreassort(i.e.swapgenes)andnewvirusesthatareamixofswine,humanand/oravianinfluenzavirusescanemerge.Overtheyears,differentvariationsofswinefluviruseshaveemerged.Atthistime,therearefourmaininfluenzatypeAvirussubtypesthathavebeenisolatedinpigs:H1N1,H1N2,H3N2,andH3N1.However,mostoftherecentlyisolatedinfluenzavirusesfrompigshavebeenH1N1viruses.如今有多少种猪流感病毒？就像所有的流感病毒一样，猪流感病毒也在不停地变化当中。禽流感，人流感以及猪流感病毒都会对猪造成感染；当不同种来的流感病毒同时感染时，病毒之间就会重新“洗牌”(交换基因)，从而产生一种新的“禽人猪”混合病毒。随着时间的'推移，也出现了猪流感病毒的