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Middle East Journal of Digestive Diseases، جلد ۱۴، شماره ۲، صفحات ۲۰۷-۲۱۳
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عنوان انگلیسی Efficacy of Disc Diffusion and Agar Dilution Methods in Evaluating Helicobacter Pylori Susceptibility to Antibiotics
چکیده انگلیسی مقاله BACKGROUND: In this study, efficacy and consistency of disc diffusion (DD) and agar dilution (AD) methods in determining Helicobacter pylori ( H. pylori) susceptibility to antibiotics were evaluated using Brucella blood agar (BBA) in both methods and tetrazolium egg yolk agar (TEYA) in AD. METHODS: 20 H. pylori isolates were tested for susceptibility to nine antibiotics; metronidazole (MTZ), clarithromycin (CLR), amoxicillin (AMX), tetracycline (TET), ofloxacin (OFX), levofloxacin (LVX), ciprofloxacin (CIP), furazolidone (FRZ), and rifampin (RIF). Antibiotics solutions were impregnated into blank paper disks on BBA in the DD method or added to BBA (ADB) or TEYA (ADT) media in the AD method. Suspensions of H. pylori isolates were surface or spot inoculated on solid media. Plates were incubated in CO 2 incubator at 37°C for 5-7 days. RESULTS: The highest rate of susceptibility to MTZ (65%) was determined by DD method compared with AD method (ADB: 40%, ADT: 30%). Both methods showed similar CLR (85%) and AMX (100%) susceptibility rates. Susceptibility to remaining antibiotics, determined by DD and ADB/ADT media were in respective order as 95%, 75% / 75% for TET, 100%, 95% / 85% for FRZ, 85%, 85% / 75% for OFX, 90%, 95% / 85% for LVX, 90%, 85% / 85% for CIP, and 100%, 85% / 75% for RIF. CONCLUSIONS: DD and AD methods showed consistency in determining 161 (89.4%) susceptibility and resistance and inconsistency in determining 19 (10.6%) susceptibility and resistance ( p < 0.05). DD is recommended as a cheap and easy method with the efficacy and precision comparable to the AD method in determining H. pylori susceptibility to antibiotics.
کلیدواژه‌های انگلیسی مقاله H. pylori,Antibiotic susceptibility,Disc diffusion,Agar dilution
نویسندگان مقاله | Fariborz Mansour-Ghanaei
Department of Microbiology, School of Biology, University College of Sciences, Tehran University, Tehran, Iran.


| Gelareh Poostizadeh
Gastrointestinal and Liver Diseases Research Center (GLDRC), Guilan University of Medical Sciences, Rasht, Iran


| Farahnaz Joukar
Department of Microbiology, School of Biology, University College of Sciences, University of Tehran, Tehran, Iran.


| Farideh Siavoshi


نشانی اینترنتی http://mejdd.org/index.php/mejdd/article/view/2541
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