Uropathogenic Escherichia coli ( UPEC) is the most common pathogen causing urinary tract infection ( UTI).Various virulent factors of UPEC involved in the pathogenic process of UTI , including adhesins, iron uptake-related factors, protectins, and toxins.Adhesion factors can help UPEC to adhere to the surface of the epithelial cell in the host urinary tract.Iron ion acquisition factors can help the pathogen to get iron from the host body , and then multiply and cause disease.Various toxins produced by the pathogen can cause damage to the host epithelial cells and release of nutrients and other nutritional factors that help UPEC to survive and grow.Protectins can protect UPEC from the host complement system mediated bactericidal effect and the phagocytosis of phagocytic cells.In this review , the most recent research progress on the various virulence characteristics of UPEC will be discussed.

OBJECTIVE To construct two-hybrid genomic library of Rhodococcus equi,and study the pathogenic mechanism of R.equi.METHODS The genomic DNA of R.equi was partially digested and cloned into AD vector of two-hybrid system,the number of independent clone and the size of insert fragment were detected as the quality index of the library.RESULTS The independent clone of the library was 1?106 and the average size of insert fragment was 2.3 kb.CONCLUSIONS The pathogenic mechanism of R.equi is not clear and it is very important for this study to construct two-hybrid genomic library.

With the rapid development of clinical laboratory technology and clinical improvement,the discordance between department of microbiology and clinical departments got more and more.Based on the analysis of interface issues existed between them,we discussed and explored how to do a wonderful job to communicate with each other.(Chin J Lab Med,2013,36:375-376)

Virus-like particles ( VLPs ) are particles formed by one or several structural proteins from viruses with similar outside structure and antigenicity of the native viruses containing no virus genome.VLPs antigen can be produced in yeasts, mammalian cells, plant cells, insect cells and bacteria.VLPs vaccine can induce immune response effectively.Other adjuvant or polypeptide can be integrated into VLPs to construct chimeric vaccines.This review focuses on research progress of virus-like particles and its application in the prevention and control of infectious diseases.

Klebsiella Pneumoniae is an important pathogen for various infections clinically,in which hypervirulent Klebsiella pneumoniae (hvKP) mainly causes pyogenic liver abscess.By now,there are no standardized method to identify hvKP strains.hvKP strains are usually with hypermucoviscous phenotype,and the prevailing serotypes and clonal types are K1,K2 and CC23,CC65,respectively.Genes rmpA,magA,alls and kfu contribute to the pathogenicity of hvKP.This paper reviews the identification,clonal types and serotypes,hypermucoviscous phenotype and some other virulent genes of hvKP.

Objective To investigate the immunoisolation effect of xenografts of microencapsulated human chromaffin cells (HCCs) .Methods HCCs were microencapsulated with APA microcapsules. Forty-eight SD rats were randomly divided into 3 groups ( n = 16 each) . HCCs (group I ) , empty APA microcapsules (group II ) and microencapsulated HCCs (group III ) were implanted into the anterior chamber of the eyes and the sole of the feet. Seven days after transplantation blood samples were collected for determination of serum IL-2, IgG and IgM concentration. The right eye-balls and left feet were obtained for microscopic examination. Results The serum IL-2, IgG and IgM concentrations were significantly lower in group II and group III than in group I ( P

OBJECTIVE To evaluate the antibacterial effect of sulbactam combined with minocycline against 110 multidrug-resistant Acinetobacter baumannii strains.METHODS Checkerboard method was designed and agar dilution method was used for the MIC testing of sulbactam combined with minocycline against 110 multidrug-resistant A.baumannii strains,and the fractional inhibitory concentration(FIC) index was calculated according to MIC value.RESULTS The MIC50 of sulbactam was reduced significantly and the antimicrobial activities had been reinforced remarkably when combined with minocycline.The FIC results suggested that the main interaction be synergism(22%) and additivity(74%),with only 5% non-effect and without antagonism.CONCLUSIONS Synergism and additivity are the main effects for subactam when combined with minocycline against multidrug-resistant A.baumannii.

Objective To investigate the clinic and endosoopic features of left-sided portal hypertension ( LSPH). Methods Eight patients with left-sided portal hypertension were analyzed retrospectively. Results The main manifestations of patients with LSPH were hematemesis, hematochezia, splenomegaly and hypersplenism. The patients have the features of pancreatic disease, but without the evidences of hepatic disease. Solitary gastric varices account for 62. 5% , both gastric and esophageal varices account for 37. 5% . The patients with features of LSPH often mislead to diagnose as blood diseases or portal hypertension resulted from hepatic cirrhosis. Conclusions Pancreatic diseases may lead to portal hypertension, solitary gastric varices were the important evidence of left-sided portal hypertension.

Objective To compare the effectiveness and adverse effects among three groups of patients with esophageal achalasia treated with small balloon dilation and/or intrasphincteric injection of botulinum toxin. Methods Forty-eight patients were divided randomly into three groups, A, B, and C, treated with small balloon dilation, intrasphincteric injection of botulinum toxin, and combination of these two respectively. At 1 week, 3 months and 1 year after treatment, the clinical scores, lower oesophageal sphincter-ic pressure, and lower oesophageal sphincteric relax rate in three groups were compared. Results At 1 week, 3 months and 1 year after treatment, the effective rates and gaps of pre - and post - treatment LESP and LESRR were higher in group B and C than those in group A. There were no differences between BT group and combination group at 1 week and 3 months, but in 1 year after treatment the effective rates and gaps of LESP and LESRR in combination group were higher than those in BT group. Complications never happened in all groups. Conclusion The combination of small balloon dilation and intrasphincteric injection of botulinum toxin was the effective procedure with the advantages of lasting longer time, less complications and milder chest pain.

Objective To study the CT and MR imaging feature of adult sphenoid spontaneous cerebrospinal fluid (CSF) rhinorrhea and accompanying intracranial hypertension. Methods Thirty consecutive patients including 11 males and 19 females with mean age of (50 ± 8) years (range, 31 to 64 years) were retrospectively reviewed. Imaging findings in 30 patients with adult sphenoid spontaneous CSF rhinorrhea (CT in 26 patients, MR in 29 patients, and both CT and MR in 25 patients) were analyzed. The MR imaging and CT features were evaluated by two experienced head and neck radiologists. The CT and MR imaging parameters of 30 fistulas were evaluated, including side, location, size, amount, bony change, and the adjacent structures change. Results Of the 30 patients of adult sphenoid spontaneous CSF rhinorrhea lesions, the site of the CSF fistula confirmed by endoscopy surgery was at the junction of the roof of the inferolateral recess and the floor of the middle cranial in 25 (83%, 25/30) patients, the roof of the inferolateral recess in 3 (10%,3/30) patients, and the lateral wall of the sphenoid sinus in 2 (7%,2/30). CT images revealed the osseous defects of the sphenoid sinus walls in 21 patients (80.7%, 21/26) patients, excessive pneumatization of the inferolateral recess of the sphenoid sinuses in 25 cases (96.1%, 25/26). MRI demonstrated the linear hyperintensity communicating subarachnoid space and sphenoid cavity, accompanying meningoencephalocele in 26 (89.6%, 26/29) patients, sphenoid sinus filled with CSF in 24 (82.7%,24/29) patients and air-fluid level in the sphenoid sinus in 8 cases (27.6%, 8/29), excessive expansion of adjoining lateral fissure cistern in 22 cases (75.9%,22/29), adjoining sulcus in one case (3.4%, 1/29), adjoining lateral ventricle in one case (3.4%,1/29). The imaging feature of accompanying intracranial hypertension included empty sella in 29 cases (100%, 29/29), augmentation of the complex of the optic sheath in 27 cases (93.1%, 27/29), the arachnoid pits in the middle cranial fossa in 30 cases (100%). Conclusions The spontaneous CSF fistula coexists with intracranial hypertension. The combined application of CT and MRI can accurately identify the fistula with accompanying symptom and the intracranial hypertension.