EVALUATION OF CLARITHROMYCIN RESISTANCE AMONG IRANIAN HELICOBACTER PYLORI ISOLATES BY E-TEST AND REAL-TIME POLYMERASE CHAIN REACTION METHODS

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HAKEMI VALA MOJDEH; EYVAZI SHIRIN; GOUDARZI HOSSEIN; SARIE HAMID REZA; GHOLAMI MEHRDAD

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Journal: Jundishapur Journal of Microbiology Year:2016 | Volume:9 | Issue:5 Page(s): 0-0

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Title

EVALUATION OF CLARITHROMYCIN RESISTANCE AMONG IRANIAN HELICOBACTER PYLORI ISOLATES BY E-TEST AND REAL-TIME POLYMERASE CHAIN REACTION METHODS

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Keywords

CLARITHROMYCIN

REAL-TIME POLYMERASE CHAIN REACTION

HELICOBACTER PYLORI

Abstract

Background: HELICOBACTER PYLORI is an important pathogen of human gastric mucosa. Antibiotic resistance, especially resistance to CLARITHROMYCIN is a major factor for treatment failure of H. pylori infections. The main mechanism of CLARITHROMYCIN resistance in these bacteria is related to point mutations in three different locations of 23S rRNA gene.Objectives: The aims of this study were to evaluate the resistance rate to CLARITHROMYCIN among local H. pylori isolates by the E-test method and to determine the profile of point mutation in 23S rRNA by REAL-TIME POLYMERASE CHAIN REACTION (PCR) method.Patients and Methods: Eighty biopsy samples were collected from dyspeptic patients by endoscopy during 2011 - 2012. All samples were homogenized immediately and cultured on supplemented brucella blood agar and incubated under microaerophilic conditions. Further biochemical tests and ureC gene PCR was done for H. pylori confirmation. The H. pylori OC1096 strain was used as the control strain, simultaneously. Frequency of CLARITHROMYCIN resistance was determined by the E-test method based on the clinical and laboratory standard institute (CLSI) standards. Point mutation profile was determined by real-time PCR and further analysis of melting curve, amplicon sequencing was done continuously.Results: From 80 biopsy samples, 20 positive H. pylori isolates were detected and confirmed by biochemical tests and PCR method. Overall, 21.7% of the H. pylori isolates, showed CLARITHROMYCIN resistance phenotype by use of the E-test. Also, the minimal inhibitory concentration of CLARITHROMYCIN was determined as³0.5 mg/L by the E-test method. Only point mutation in the location of A2143G with melting temperature of 54.7oC was observed in all resistant isolates.Conclusions: This study showed that the frequency of H. pylori CLARITHROMYCIN resistance in Iran is relatively high. Since CLARITHROMYCIN is not commonly used in Iran for H. pylori eradication, the high rate of resistance could be related to cross-reactivity between other macrolides. Therefore, macrolide antibiotics must be prescribed with precaution in any case of treatment other than H. pylori infections. All resistant isolates showed A2143G mutation in 23S rRNA as the dominant pattern of point mutation at least in Tehran H. pylori isolates.

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APA: Copy

HAKEMI VALA, MOJDEH, EYVAZI, SHIRIN, GOUDARZI, HOSSEIN, SARIE, HAMID REZA, & GHOLAMI, MEHRDAD. (2016). EVALUATION OF CLARITHROMYCIN RESISTANCE AMONG IRANIAN HELICOBACTER PYLORI ISOLATES BY E-TEST AND REAL-TIME POLYMERASE CHAIN REACTION METHODS. JUNDISHAPUR JOURNAL OF MICROBIOLOGY (JJM), 9(5), 0-0. SID. https://sid.ir/paper/317628/en

Vancouver: Copy

HAKEMI VALA MOJDEH, EYVAZI SHIRIN, GOUDARZI HOSSEIN, SARIE HAMID REZA, GHOLAMI MEHRDAD. EVALUATION OF CLARITHROMYCIN RESISTANCE AMONG IRANIAN HELICOBACTER PYLORI ISOLATES BY E-TEST AND REAL-TIME POLYMERASE CHAIN REACTION METHODS. JUNDISHAPUR JOURNAL OF MICROBIOLOGY (JJM)[Internet]. 2016;9(5):0-0. Available from: https://sid.ir/paper/317628/en

IEEE: Copy

MOJDEH HAKEMI VALA, SHIRIN EYVAZI, HOSSEIN GOUDARZI, HAMID REZA SARIE, and MEHRDAD GHOLAMI, “EVALUATION OF CLARITHROMYCIN RESISTANCE AMONG IRANIAN HELICOBACTER PYLORI ISOLATES BY E-TEST AND REAL-TIME POLYMERASE CHAIN REACTION METHODS,” JUNDISHAPUR JOURNAL OF MICROBIOLOGY (JJM), vol. 9, no. 5, pp. 0–0, 2016, [Online]. Available: https://sid.ir/paper/317628/en

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