Showing 6 results for Livani
H Bagheri, A Ghaemi, M Aslani, N Mozafari, S Livani, T Dadgar,
Volume 2, Issue 1 (Spring - Summer 2008[PERSIAN] 2008)
Abstract
Abstract Background and objectives: Diarrhea is one of the main cases of morbidity and mortality among children in developing countries. Enteroaggregative Escherichia coli (EAggEC) is an emerging diarrheal pathogen that has been associated characteristically with persistent diarrhea among infants, particularly in the developing Counties. Therefore, we decided to study the prevalence of enteroaggregative strain in cases of Diarrhea in Gorgan by PCR method. Material and Methods: This descriptive study was carried out on 455 subjects suffered from Diarrhea in Gorgan during one year (2005-6). At first, the samples were cultivated on the MacConkey agar and EMB agar media, Then all colony Suspected to E.coli were chosen and their DNA extracted by phenol chloroform method. The result was obtained by the selected primer, PCR method. Results: of 455 samples, Twenty cases (4/4%) including men (12) and woman (8) are positive for EAggEC, 85% of sufferers are under 5 years old (45.8% of them are under one year old). The Prevalence of this gene in Summer , Autumn ,Winter ,Spring are 5.3% , 4.2% , 4.1% and 1.8% ,respectively. Conclusion: Based on the prevalence of Enteroaggregative Escherichia coli (EAggEC) in Diarrheagenic cases in Gorgan (4.4%), we do recommend using molecular methods, which are reliable and less expensive than classic methods, in detecting of microorganisms. Key words: Entroaggregative Escherichia coli, Diarrhea, PCR, Gorgan.
N Ziaei, N Amir Mozafari, H Kouhsari, A Moradi, A Tabarai, T Dadgar, S Livani, M Arab Ahmadi,
Volume 2, Issue 2 (Autumn – Winter 2009[PERSIAN] 2008)
Abstract
Abstract Background and Objectives: Diarrhea is one of the most common diseases in the world. Campylobacter jejuni is one of the prevalent agents of bacterial diarrhea in most of developing countries. It is usually ignored in routine laboratory test in our country, because it has a difficult investigation method. This article aims to determine the prevalence of Campylobacter jejuni, in diarrhea samples in Gorgan City (East north of Iran) by PCR Method. Material and Methods: This descriptive study was performed on 455 diarrheal samples during one year (2005-06).255 out of them were cultured on Preston media (Himedia co.) on 42°c. DNA Extracted by phenol cholorophorm method was directly carried out on stool samples.16srDNA hipo and asp primers for detection of Campylobacter genus, C.jejuni and C.coli species were used, respectively. In addition, universal primer of 16srDNA was used for control of PCR method. Results: no sample was positive for Campylobacter in culture .only three samples were positive for Campylobacter genus and C.jejuni specific primer but none of them were positive for C.coli .99 samples were positive by universal primer of 16srDNA . Conclusion: The results indicate that C.jejuni isn't a prevalent agent in diarrhea in our region. Key words: Campylobacter jejuni -Gorgan- Diarrhea
F Ghasemi Kebria, B Khodabakhshi, H Kouhsari, M Sadeghi Sheshpoli, N Behnampoor, S Livani, M Bazuori, E A Ghaemi,
Volume 4, Issue 1 (Spring - Summer 2010[PERSIAN] 2010)
Abstract
Abstract Background and objectives: After respiratory infection, Diarrhea is the second cause of mortality. Yersinia enterocolitica is the second important cause of infectious diarrhea in children of some countries. In this study, we evaluated the frequency of Yersinia entocolitica of diarrheal specimens in Gorgan, Iran. Material and Methods: This descriptive cross - sectional Study was carried out on diarrheal stools of 455 patients referred to medical centers and laboratory of Gorgan in 2004-2005. DNA extraction using phenol chloroform was performed for all samples. Using two specific primers (genus-specific16s rRNA and ail- specific species genus of Yersinia enterocolitica), we did PCR sample. Results: Yersinia genome was identified in 12 patients(2.63%) and 11 of them was Yersinia enterocolitica. The frequency infection in of girls (3%) was more than boys (2.4%), and the prevalence in winter (4%) was more them other seasons, and under one- year- group (3.4%) and 1-5 years (3.1%) is more than other age groups. It was not observed significant difference. (P> 0.05). Conclusion: The frequency of Yersinia in cases of diarrhea in Gorgan is similar to most regions of Iran and in children under 5 years is observed more in winter. Key words: Yersinia enterocolitica, Diarrhea, children, Gorgan
Livani S, Mirinargesi M, Nemati-Shoja E, Rafiei S, Taziki M, Tabarraei A, ,
Volume 5, Issue 2 (Autumn – Winter 2011[PERSIAN] 2011)
Abstract
Abstract Background and objectives: Identification and monitoring of multidrug-resistant Mycobacterium tuberculosis strains (MDR) is highlighted by the high risk of their spreading in different areas. Prevalence of these strains was evaluated in Golestan province in northeast of Iran. Material and Methods: Drug susceptibility testing to Isoniazid and rifampin was carried out for 148 clinical samples that had grown in Mycobacteria growth indicator tube (MGIT) system, according to the manufacturer's instructions (Becton-Dickinson, USA). The association of drug resistance frequency with demographic characteristics and growth time were investigated. The appropriate statistical tests, X2 and student T- test were performed for comparison of these variants. A p value>0.05 was considered significant in all cases. Results: The turnaround time required for growth of Mycobacterium tuberculosis in MGIT system was between 2 to 55 days (mean 16.3±10.4 days). Of all samples studied, 17.6% and 3.4% were resistant to Isoniazid and rifampin, respectively, and 3.4% (5 samples) were MDR (CI 95% 1-6%). The turnaround time required for determining MDR cases was 9.6 days. No statistically significant association was found between the resistance to the drugs and none of the factors including sex, age, type of clinical sample, and positivity of the smear. Conclusion: The prevalence of MDR in the studied region was determined to be 3.4% which is similar to the country-wide evaluations. The turnaround time for Mycobacterium growth and anti drug susceptibility result can be shortened by MGIT method. Key words: Mycobacterium tuberculosis, Mycobacterium Growth Indicator Tube, Multidrug Resistant
Livani, S., Ghaemi, Ea,
Volume 8, Issue 3 (Autumn[PERSIAN] 2014)
Abstract
Abstract Mycobacterium genus, including pathogenic and environmental species, is called non-tuberculosis mycobacteria. In this review, we assessed the research about the frequency of non-tuberculosis mycobacteria in Iran. The analyses showed that there are 16 and 28 mycobacterial species isolated in water and soil samples, respectively. The most frequent mycobacterial species in water were M. fortuitum (25.4%) and M. chelonae (25.4%), and in soil it was M. fortuitum (19.7%). The most frequent species in clinical samples was M. fortuitum, too. The frequency of non-tuberculosis mycobacteria in various clinical samples was various, and on average 1.1% of the suspected tuberculosis clients referred to the healthcare centers have non-tuberculosis mycobacteria. Keywords: Environmental Mycobacteria, Non-Tuberculous Mycobacteria, Iran, M. fortuitum
Seyedeh Masoumeh Mirtaghi, Parisa Torbati Nejad , Masoumeh Mazandarani, Fasiheh Livani, Hanieh Bagheri ,
Volume 10, Issue 5 (Sep-Oct-2016 2016)
Abstract
Background and Objective: Nowadays, incidence of antibiotic-resistance among pathogenic bacteria has increased due to indiscriminate use of antimicrobial drugs for treatment of diseases, especially urinary tract infections. Medicinal plants are also of great importance as antibacterial agents. Therefore, the aim of this study was to determine the antibacterial effect of ethanolic extract of nettle (Urtica dioica L.) leaves using two methods of disk diffusion and well diffusion.
Methods: Ethanolic extract of nettle leaves was prepared by the percolation method. Effect of different concentrations of the extract on Escherichia coli (PTCC1399), Staphylococcus aureus (PTCC 1431), Staphylococcus epidermidis (PTCC 1435) and Staphylococcus saprophyticus (PTCC1440) was evaluated using the disk diffusion and well diffusion methods by measuring diameter of growth inhibition zone. Gentamicin and propylene glycol were used as positive and negative control, respectively.
Results: In both methods, especially in the well diffusion, the ethanolic extract of nettle leaves had favorable inhibitory effect on the growth of S. aureus, S. epidermidis and S. saprophyticus. In the well diffusion method, the highest rate of susceptibility to the extract (89%) was related to S. saprophyticus and S. epidermidis.
Conclusion: The ethanolic extract of nettle leaf has good inhibitory effect on the growth of S. aureus (especially in the well diffusion method), which confirms the traditional use of this plant for the treatment of urinary tract infections.
Keywords: Antibacterial Effect, Staphylococcus, E. Coli, Ethanolic Extract, Nettle (Urtica dioica L.).
