尿素酶试验的最佳pH

尿素酶试验过去一直用来鉴别变形杆菌。由于变形杆菌的尿素酶活性很强,对于实验条件无特殊要求。除变形杆菌外,具有较强尿素酶活性的细菌还有克雷伯氏菌,耶尔森氏菌。而柠檬酸杆菌和阴沟杆菌,则被认为是尿素酶阴性的细菌,或少数为阳性或迟缓阳性,在菌属鉴     

沙门氏菌Ⅱ的三个新血清型

Eight cultures isolated from intestinal contents of reptiles were belonged to 3 new serotypes of Salmonella. They were all ducitol fermented, malonate utilized, but not attack lactose and salicin, no growth in KCN broth, ONPG negative. Therefore, they would be included in Salmonella II. They were all attacked by Felix phage O-I. Three represented strains were selected for antigen analysis. Their antigenic formula were identified as follows: S3194 Salmonella II 6,7:1,v:e,n,z15 S3196 Salmonella II 6, 7:y: e, n, z(1)5 S3195 Salmonella II 6, 8: e, h: 1,2 Among them, S3196 was indole positive belonging to a rare biotype. In addition, there were two other cultures as well as the formula of S3194, and three other cultures as well as the formula of S3196 (one of indole positive, two of indole negative).     

应用肠杆菌科四个属的诊断噬菌体快速诊断沙门氏菌

本文报告应用弗氏柠檬酸细萄噬菌体3组,大肠埃希氏菌噬菌体4组,阴沟肠杆菌噬菌体1组和沙门氏菌O-I噬菌体快速诊断沙门氏菌的结果。沙门氏菌0-I噬菌体可裂解沙门氏菌属地方株1393株中的1351株(97％)。柠檬酸细菌属噬菌体和共可裂解柠橡酸细菌属地方株381株中的362株(95％)。阴沟肠杆菌噬菌体Ent可裂解阴淘肠杆菌地方株l 50株中的133株(84．2％)。埃希氏菌属噬菌体E—1、E一2、E-3和E-4共可裂解埃希氏菌属地方株683株中的567株(83％)。由于E一1和E一2噬菌体的联合使用,可使o I噬菌体对埃希氏菌属地方株的误诊率从6．3％下降到0．6％。E一4噬菌体对沙门氏菌属地方株的误诊率可因与。一I噬菌体的联合使用而从0．36％下降到0．07％。     

弗氏柠檬酸细菌噬菌体的生物学特性

从属内溶菌谱分属于3个群的弗氏柠檬酸细菌噬菌体中,选出13株制成免疫血清,经血清中和试验,可将5l株噬菌体分为6个血清群,11个血清型。以电镜观察形态为基础,结合一级生长试验,噬菌斑形态观察,对温度、pH和柠檬酸钠试验,将13株噬菌体分为3类：第一类2株。具有等轴六角形头部和易弯曲的长尾,尾部无收缩性,属于长尾病毒科。血清学属于A群和B群,群间有低度相关。属内溶菌谱属于I类。 第二类4株。具有长六角形的头部和复杂尾,属于肌病毒科。血清学同属c群。属内溶菌谱分属于和I类。第三类7株。具有六角形头部和复杂尾,可能也属于肌病毒科。血清学分属于D、E、E群,群间有低度相关。属内溶菌谱属于币ll和币I“类。     

沙门氏菌II的三个新血清型

从蛇肠内容物中分离到的8株沙门氏菌,分属于3个新的血清型。8株菌的培养物均可发酵卫矛醇,利用丙二酸钠,但不发酵乳糖和水杨苷．KCN肉汤内不生长,ONPG试验阴性,故应归属于沙门氏菌II。8株菌的培养物均可被沙门氏菌。O-I噬菌体裂解。选出了代表菌株作抗原分析,确定它们的抗原式为：S319411 6,7：1,V：e,n,z15;S319611 6,7：y：e,n,z15;S3195 II 6,8：e,h：1,2。S3196是靛基质阳性的罕见生物型。其他的5株培养物,有2株具有与S3194相同的抗原式,3株具有与S3196相同的抗原式(1株靛基质阳性,2株阴性)。     

沙门氏菌Ⅲb的一个新血清型

An enterobacterium culture, S3188, providing with Salmonella biological characteristics, except exhibiting indole positive reaction, was isolated from the intestinal content of reptile a snake. It utilized malonate, did not ferment dulcitol, it attacked lactose promptly, and ONPG positive. H antigens appeared diphasic. By cross agglutination and absorption tests, it was demonstrated that the antigenic formula of this strain is 53:1, Z13:e, n,(Z15)... It was found to be a new serotype of Salmonella IIIb.     

沙门氏菌IIIb的一个新血清型

从蛇肠内容物中分离到一株沙门氏菌,编号为S3188,符合沙门氏菌属的生化特性,但具有靛基质阳性的异常反应。该菌株能利用丙二酸钠,不发酵卫矛醇,迅速发酵乳糖,ONPG为阳性,具有双相H抗原,应归属于沙门氏菌IIIb。经抗原分析。该菌株的抗原式确定为53：1,Z13：c,n,(z15)…,是新的沙门氏菌血清型。