△LuxS的表型分析及其在GBS毒力调控机制研究中的应用

目的采用LuxS缺失突变株模型对B型链球菌中数量感应相关分子LuxS的功能及与其相关的自诱导因子-2数量感应通路进行研究，以探索其毒力调控机制。方法采用RT-PCR法、菌落印迹分析、生长曲线测定、cAMP因子测定等方法对该缺失突变菌株的表型特性进行了研究。最后应用哈氏弧菌作为报告菌株，通过生物发光测定法分析了突变株对B型链球菌诱导报告菌株中的生物发光活性的影响。结果发现此缺失突变可导致B型链球菌中scpB基因表达的上调；与野生株相比，突变株的生物发光诱导活性比野生株降低了大约两倍。结论本研究结果证实了LuxS在GBS中AI-2数量感应通路中的重要性，并为GBS中毒力调控机制的进一步研究提供了新的线索。     

Detecting pediatric autoimmune neuropsychiatric disorders associated with streptococcus in children with obsessive-compulsive disorder and tics.

BACKGROUND: A subgroup of children with obsessive-compulsive and tic disorders are proposed to have an infectious trigger. The purpose of this study was to investigate the relationship between group A streptococcal titers and symptom fluctuations in children with a clinical course resembling that described for pediatric autoimmune neuropsychiatric disorders associated with streptococcus. METHODS: Twenty-five children with obsessive-compulsive disorder and/or tic disorder were evaluated for neuropsychiatric severity and group A streptococcal antibody titers (streptolysin O, deoxyribonuclease B, and carbohydrate A) at 6-week intervals for > or = six consecutive evaluations (total visits=277). RESULTS: Children with large symptom fluctuations (n=15) were compared with children without dramatic fluctuations (n=10). Co-movements of obsessive-compulsive/tic severity and group A streptococcal antibodies were assessed. In subjects with large symptom changes, positive correlations were found between streptococcal titers and obsessive-compulsive severity rating changes (p=.0130). These subjects were also more likely to have elevated group A streptococcal titers during the majority of observations (p=.001). Tic symptom exacerbations occurred more often in the fall/winter months than spring/summer months (p=.03). CONCLUSIONS: Patients with marked obsessive-compulsive/tic symptom changes may be characterized by streptococcal titer elevations and exhibit evidence of seasonal tic exacerbations.     

Brain abscess in Saudi Arabia

There are significant variations among countries in the incidence of brain abscess. We report here 26 cases of brain abscess treated at the Neurosurgery Department of King Faisal University and Dammam Central Hospital Saudi Arabia over a six year period (1982–1988). This is 2.3% of total admissions to the two neurosurgery departments serving a population of approximately 1.2 million in the same period.Young males were most often affected (M/F ratio 3.3:1; 31% were less than 15 years old, 46% aged between 15–39 years, and 23% older than 40 years). Streptococcus was found to be the most common microorganism (38.4%). Mixed infection was seen in 15.3%, and sterile abscesses were found in 11.5% of the patients after aerobic and anaerobic cultures of the pus. Chronic otitis media and paranasal sinusitis predisposed the patients to abscess formation in 57.6% of the cases. The temporo-parietal area was the commonest site. Epilepsy was a complication in 30.7% of our patients, and the mortality rate was 15.3%.     

教室空气中微生物和CO_2的形成、分布及其相互关系的研究

对初中学生鼻咽部溶血性链球菌（ＨＳ）和教室空气中微生物和ＣＯ２调查得出：学生鼻咽部携带ＨＳ除坐前右位外，其他各处皆有检出（４／５０）；空气中ＨＳ从早读开始后迅速上升２８．７倍（Ｐ＜０．０１），至第二节课下课前达全日最高峰（６５．５倍），细菌总数（ＢＴ）和ＣＯ２的时间分布亦呈现与ＨＳ相似的特征（ｒ＝０．７４３和０．８２０Ｐ＜０．０１），但其峰度不及ＨＳ突出；ＨＳ及ＢＴ的最低值在教室前右方，最高值在后右及中央（Ｐ＜０．０１）。而ＣＯ２最高浓度在教室垂直高度的２．０ｍ处。表明：室内空气中微生物和ＣＯ２的形成和分布主要受到学生鼻咽部携带ＨＳ能力及呼吸与学习活动的影响，当然与空气自身的紊流和层流、冷空气从门缝侵入及污染物的性状也有关。     

PMN对链球菌组蛋白样蛋白释放的影响

为观察人多形核白细胞 (PMN)对链球菌组蛋白样蛋白 (HlpA)释放的影响 ,将PMN与链球菌以一定比例共同作用后取上清液做免疫印迹试验。发现与抗HlpA抗体特异性结合的蛋白条带。提示PMN作用于链球菌后 ,HlpA能自菌体内释放出来     

Autoantibodies against the common antigenic determinant of group a streptococcal polysaccharide and epithelial cells of mammalian thymus and skin

A cross-reacting (CR) antigen, group A streptococcal polysaccharide and antigen of mammalian thymus and skin, was studied. The CR antigen was found in all adult human and embryonic tissues regardless of blood group, in all animals of different species studied, and in the tissues of rabbits immunized with streptococci and producing antibodies against A-polysaccharide. The results indicate that antibodies developing against the CR-determinant of A-polysaccharide and epithelial tissues belong to the class of autoantibodies. The reaction of these autoantibodies with the CR antigen is probably one cause of the development of autoimmune thymitis in rheumatic fever.Laboratory of Streptococcal Infections, N. F. Gamaleya Institute of Epidemiology and Microbiology, Moscow. (Presented by Academician of the Academy of Medical Sciences of the USSR O. V. Baroyan.) Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 81, No. 5, pp. 570–572, May, 1976.     

Monoclonal antibodies cross-reacting with fibroblasts of myocardial interstitial connective tissue and with group a streptococcal cell wall protein antigens

N. F. Gamaleya Research Institute of Epidemiology and Microbiology. Institute of Rheumatology, Academy of Medical Sciences of the USSR, Moscow. (Presented by Academician of the Academy of Medical Sciences of the USSR, P. A. Vershilova.) Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 108, No. 7, pp. 74–76, July, 1989.     

Risk factors,clinical course and outcomes of pregnancy-related group A streptococcal infections: retrospective 13-year cohort study

Objectives

To investigate the incidence, risk factors, clinical course and outcomes of pregnancy-related group A streptococcus (GAS) infection.

Morphological changes in the internal organs in chronic streptococcal infection

A histological and histochemical study was made of the internal organs of albino mice at various times (from 24 h to 27 weeks) after a single intraperitoneal injection of L-forms of -hemolytic group A streptococci. A progressive pathological process (myocarditis, hepatitis, glomerulonephritis) against a marked allergic bacground and leading to systemic lesions of the tissues was discovered.Institute of Human Morphology, Academy of Medical Sciences of the USSR. N. F. Gamaleya Institute of Epidemiology and Microbiology, Academy of Medical Sciences of the USSR, Moscow. (Presented by Academician of the Academy of Medical Sciences of the USSR A. P. Avtsyn.) Translated from Byullten' Éksperimental'noi Biologii i Meditsiny, Vol. 80, No. 9, pp. 111–115, September, 1975.     

降钙素原、C-反应蛋白与妊娠晚期B族链球菌感染状态的关系

目的探讨血清降钙素原(procalcitonin,PCT)、C-反应蛋白(C-reactive protein,CRP)水平在妊娠晚期B族链球菌(group B streptococcus,GBS)阳性孕妇感染状态中的判断价值。方法选取2018年4月至2019年12月在华北理工大学附属医院分娩的妊娠晚期GBS阳性孕妇190例为研究对象,其中GBS带菌46例(GBS带菌组)、GBS亚临床感染120例(GBS亚感染组)、绒毛膜羊膜炎24例(GBS羊膜炎组);选择同期在我院分娩的正常妊娠晚期孕妇20例为正常组。待研究对象分娩后,取母体肘静脉血,采用电化学发光法检测血清CRP、PCT水平,分析每组孕妇血清CRP、PCT水平变化。采用受试者工作特征(receiver operating characteristic,ROC)曲线分析CRP、PCT对妊娠晚期GBS阳性孕妇感染状态的诊断效能。结果GBS带菌组孕妇血清CRP水平升高,差异有统计学意义(P<0.05),PCT无明显差异;GBS亚感染组和GBS羊膜炎组孕妇血清PCT和CRP均升高,差异均有统计学意义(P<0.05)。与GBS羊膜炎组孕妇血清PCT和CRP相比较,GBS带菌组和GBS亚感染组孕妇血清PCT和CRP均降低,差异均有统计学意义(P<0.05)。与GBS亚感染组孕妇血清PCT和CRP相比较,GBS带菌组孕妇血清PCT和CRP均降低,差异有统计学意义(P<0.05)。GBS阳性孕妇血清中PCT检测的AUC分别为0.165、0.632、0.988,血清中CRP检测的AUC分别为0.168、0.687、0.934,其中血清PCT和CRP在GBS羊膜炎的诊断效能最高;GBS亚感染次之;GBS带菌的诊断效能相对最低。结论妊娠晚期GBS感染孕妇血清中PCT、CRP含量对GBS羊膜炎的预测有一定的价值,能够作为GBS阳性孕妇感染状态的早期诊断指标。