High Incidence of Virulence Factors Among Clinical Enterococcus faecalis Isolates in Southwestern Iran / 감염과화학요법

BACKGROUND: Over the past two decades, enterococci have emerged as an important agent responsible for hospital acquired infection. Several virulence factors contribute to the adherence, colonization, evasion of the host immune response, and pathogenicity and severity of the infection. Enterococcus faecalis is the most common and virulent species causing infections in hospitalized patients. The aim of the present study was to examine the prevalence of genes encoding virulence factors and antimicrobial resistance patterns of E. faecalis strains isolated from hospitalized patients in Shiraz, south west of Iran. MATERIALS AND METHODS: A total of 51 E. faecalis isolates from the urine, blood, pleural fluid, peritoneal fluid, eye discharge, endotracheal tube (ETT) and transjugular intrahepatic portosystemic shunt (TIPS) specimens of patients were identified by phenotypic and genotypic methods. Antimicrobial sensitivity tests and detection of virulence factors were performed using standard methods. RESULTS: The efa and asa1 were the most frequently detected gene (100%) among the isolates, followed by esp (94.1%), ace (90.2%), gelE (80.4%), cylA (64.7%), and hyl (51%). More than half of the isolates (52.9%) were high level gentamicin resistant (HLGR). Vancomycin resistance was observed among 23 (45.1%) isolates. The lowest antimicrobial activity was related to erythromycin (3.9%), tetracycline (5.9%) and ciprofloxacin (9.8%). No isolate was found resistant to fosfomycin and linezolid. CONCLUSION: Our data indicated a high incidence of virulence factors among E. faecalis strains isolated from clinical samples. Colonization of drug resistant virulent isolates in hospital environment may lead to life threatening infection in hospitalized patients. Therefore, infection control procedures should be performed.

Antimicrobial resistance pattern in Escherichia coli isolates obtained from a specialized women and children hospital in Shiraz, Iran: a prevalence study

Background: Escherichia coli, known as a clinically significant bacteria, can cause a wide range of infections, including urinary tract infections [UTIs], blood stream infections [BSIs], and can frequently be isolated from various clinical specimens. Evaluation of antimicrobial resistant pattern is a necessary action, especially about such bacteria which are frequent and life threatening. The aim of this study was to determine the frequency and antimicrobial resistance pattern of E. coli isolates obtained from various clinical specimens

Methods: This retrospective study was performed within a seven month period from January 2015 to August 2015 at a specialized women and children hospital in Shiraz, Iran. E. coli isolates were obtained from various clinical specimens and identified using standard microbiological procedure. Antimicrobial susceptibility patterns were determined using disk diffusion method in accordance with CLSI recommendation

Results: Of the total 130 positive cultures, the majority of E. coli isolates were obtained from urine [96=73.8%] and blood [11=8.5%] specimens. Overall, gentamicin [70.8%] was the effective antibiotic for the tested E. coli isolates. E. coli isolates obtained from urine specimens showed the highest resistance rates against ampicillin [84.4%] and nalidixic acid [61.5%]; while they showed the most sensitivity to gentamicin [79.2%], nitrofurantoin [70.8%] and ciprofloxacin [66.7%]. Moreover, the highest antibiotic resistance rates belonged to the isolates recovered from endotracheal tube [ETT]

Conclusion: The results showed that gentamicin was the most effective antibiotic against E. coli infections. However, in addition to the gentamicin, we can recommend nitrofurantoin and ciprofloxacin as the other effective agents for UTIs

First Outcome of MDR-TB among Co-Infected HIV/TB Patients from South-West Iran / 결핵및호흡기질환

BACKGROUND: Tuberculosis (TB) is the leading cause of mortality among human immunodeficiency virus (HIV) patients and the majority of them occur in developing countries. The aims of the present study were to determine the frequency of HIV/TB co-infection and other probable associated factors. METHODS: This 10 year retrospective study was conducted on 824 HIV patients in the south-west of Iran. HIV infection was diagnosed by the enzyme linked immunosorbent assay and confirmed by Western blot. TB diagnosis was based on consistency of the clinical manifestations, chest X-ray, and microscopic examination. Drug susceptibility testing was done by the proportional method on Lowenstein-Jensen media. RESULTS: Of 824 HIV patients, 59 (7.2%) were identified as TB co-infected and the majority (86.4%) of them were male. Of the overall TB infected patients, 6 cases (10.2%) showed multidrug-resistant with the mean CD4+ lymphocyte count of 163+/-166 cells/mm3. The main clinical forms of TB were pulmonary (73%). There was a significant (p<0.05) correlation between TB infection and CD4+ lymphocyte counts < or =200 cells/mm3, gender, prison history, addiction history, and highly active anti-retroviral therapy. CONCLUSION: We reported novel information on frequency of HIV/TB co-infection and multidrug resistant-TB outcome among co-infected patients that could facilitate better management of such infections on a global scale.