致病性

Am J Gastroenterol,1999;94（10）:3020-3027.［5］ Forns X,Hegerich P,Darnell A,Emerson SU,Purcell RH,Bukh J.

Sugiya-ma等［8］在儿童中的研究同样得出TTV无致病性结论。

Pathogenicity of 31 field strains of infections bursal disease viruses isolated during 1997-2001 in China was compared in SPF chickens at different ages.

为了弄清我国各地流行的IBDV毒力程度，在3—7周龄SPF鸡进行人工感染的致病性试验，以此比较研究了1997—2001年期间从我国不同地区分离到的31个IBDV野毒株。

Avian influenza virus was isolated from the caecal tonsil, faeces, and kidney of the domestic ducks. The isolated virus was identified as a highly pathogenic H5N1, with a haemagglutinin proteolytic cleavage site deduced amino acid sequence of ... QREKRKKR/GLFGAIAG ... In order to determine the pathogenicity of the isolate, eight 6-week-old specific pathogen free chickens were inoculated intravenously with the virus, and all birds died within 24 h after inoculation.

病毒抗原可以从鸭的盲肠，扁桃体，肾脏及粪便分离出来，并且确定这种病毒是高致病性的H5N1，还从血凝素蛋白分解位点推断出病毒的氨基酸序列，为了了解独立群的发病机理，对8只6周龄鸡静脉注射这种病毒，结果所有的均在注射后24小时死亡。

Aian influenza irus was isolated from the caecal tonsil, faeces, and kidney of the domestic ducks. The isolated irus was identified as a highly pathogenic H5N1, with a haemagglutinin proteolytic cleaage site deduced amino acid sequence of ... QREKRKKR/GLFGAIAG ... In order to determine the pathogenicity of the isolate, eight 6-week-old specific pathogen free chickens were inoculated intraenously with the irus, and all birds died within 24 h after inoculation.

病毒抗原可以从鸭的盲肠，扁桃体，肾脏及粪便分离出来，并且确定这种病毒是高致病性的H5N1，还从血凝素蛋白分解位点推断出病毒的氨基酸序列，为了了解独立群的发病机理，对8只6周龄鸡静脉注射这种病毒，结果所有的均在注射后24小时死亡。

Six different deletion and insertion mutants of BBSV-X were constructed and these were inoculated to Chenopodium amaranticolor. The preliminary results show that the sat-RNA could enhance symptom of BBSV-X and its insertion mutants on Chenopodium amaranticolor, but the pathogenicity of the CP deletion mutants was reduced.

构建了BBSV-X基因组6个缺失和插入突变体，将它们的体外转录物单独或与sat-RNA一起混合接种苋色藜，初步实验结果表明，sat-RNA能增强全长BBSV-X基因组及含全长基因组的突变体对苋色藜所致的症状，但减轻CP缺失突变体的致病性。

The high prevalence of resistance to chicken sera, fimbriae F1, temperature-sensitive hemagglutinin in high pathogenic isolates suggested importance of these phenotypes in the pathogenesis of colibacillosis.

结果显示禽源大肠杆菌的致病性与其血清耐受能力、鸡红细胞MSHA菌手的表达和温度敏感性血凝素的表达呈一定的相关关系。

Commensally bacteria help keep pathogenic bacteria at bay, and in the late 1990s new research was beginning to show that symbionts also contribute to the development of the intestinal architecture.

细菌共生帮助保留致病性细菌在海湾，并且在20世纪90年代末期新的研究开始表示， symbionts也对小肠建筑学的发展有用。

Six pathogenetic fungi were isolated from infected leaves of chrysanthemum. Morphology of six isolates conidia was investigated for identification.

利用组织分离法，从自然发病的菊花病叶上分离了6株对菊花具有致病性的病原真菌。

The above results can summarize the function of STK1: insignificant effect on mycelium development and growth but related to the pigment accumulation in hypha; key factor regulating the conidial development; related to the HT-toxin activity and pathogenicity.

结论推测，STK1基因对玉米大斑病菌菌丝的生长发育没有影响，但可能与菌丝中色素等物质的积累有关，并调控病菌分生孢子的发育、HT-毒素的活性和致病性。

Fig. 26. HPAI - Cyanotic comb of an infected chicken on the left compared to a normal chicken on the right

图-26。高致病性禽流感-左边受感染鸡只发绀的鸡冠与右边正常鸡只对比

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。