ASSOCIATION OF TCDA+/TCDB+ CLOSTRIDIUM DIFFICILE GENOTYPE WITH EMERGENCE OF MULTIDRUG-RESISTANT STRAINS CONFERRING METRONIDAZOLE RESISTANT PHENOTYPE

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SHAYGANMEHR FARAHNAZ SADAT; ALEBOUYEH MASOUD; AZIMIRAD MASOUMEH; ASLANI MOHAMMAD MEHDI; ZALI MOHAMMAD REZA

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Journal: Iranian Biomedical Journal Year:2015 | Volume:19 | Issue:3 Page(s): 143-148

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Title

ASSOCIATION OF TCDA+/TCDB+ CLOSTRIDIUM DIFFICILE GENOTYPE WITH EMERGENCE OF MULTIDRUG-RESISTANT STRAINS CONFERRING METRONIDAZOLE RESISTANT PHENOTYPE

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Keywords

MULTIDRUG RESISTANCE

CLOSTRIDIUM DIFFICILE

METRONIDAZOLE

Abstract

Background: Reduced susceptibility of CLOSTRIDIUM DIFFICILE to antibiotics is problematic in clinical settings. There is new evidence indicating the cotransfer of toxin-encoding genes and conjugative transposons encoding resistance to antibiotics among different C. difficile strains. To analyze this association, in the current study, we evaluated the frequency of toxigenic C. difficile among the strains with different multidrug-resistant (MDR) profiles in Iran.Methods: Antimicrobial susceptibility patterns and minimal inhibitory concentrations (MIC) of the isolates were determined against METRONIDAZOLE, imipenem, ceftazidime, amikacin, and ciprofloxacin by agar dilution method. The association of the resistance profiles and toxigenicity of the strains were studied by PCR targeting tcdA and tcdB genes.Results: Among 86 characterized strains, the highest and lowest resistance rates were related to ciprofloxacin (97%) and METRONIDAZOLE (5%), respectively. The frequency of resistance to other antibiotics was as follow: imipenem (48%), ceftazidime (76%), and amikacin (76.5%). Among the resistant strains, double drug resistance and MDR phenotypes were detected in the frequencies of 10.4% and 66.2%, respectively. All of the METRONIDAZOLE-resistant strains belonged to tcdA+/ tcdB+genotype with triple or quintuple drug resistance phenotypes. MIC50 and MIC90 for this antibiotic was equally £ 8 mg/ml.Conclusion: These results proposed the association of tcdA+/ tcdB+genotype of C. difficile and the emergence of resistance strains to broad-spectrum antibiotics and METRONIDAZOLE.

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APA: Copy

SHAYGANMEHR, FARAHNAZ SADAT, ALEBOUYEH, MASOUD, AZIMIRAD, MASOUMEH, ASLANI, MOHAMMAD MEHDI, & ZALI, MOHAMMAD REZA. (2015). ASSOCIATION OF TCDA+/TCDB+ CLOSTRIDIUM DIFFICILE GENOTYPE WITH EMERGENCE OF MULTIDRUG-RESISTANT STRAINS CONFERRING METRONIDAZOLE RESISTANT PHENOTYPE. IRANIAN BIOMEDICAL JOURNAL, 19(3), 143-148. SID. https://sid.ir/paper/277338/en

Vancouver: Copy

SHAYGANMEHR FARAHNAZ SADAT, ALEBOUYEH MASOUD, AZIMIRAD MASOUMEH, ASLANI MOHAMMAD MEHDI, ZALI MOHAMMAD REZA. ASSOCIATION OF TCDA+/TCDB+ CLOSTRIDIUM DIFFICILE GENOTYPE WITH EMERGENCE OF MULTIDRUG-RESISTANT STRAINS CONFERRING METRONIDAZOLE RESISTANT PHENOTYPE. IRANIAN BIOMEDICAL JOURNAL[Internet]. 2015;19(3):143-148. Available from: https://sid.ir/paper/277338/en

IEEE: Copy

FARAHNAZ SADAT SHAYGANMEHR, MASOUD ALEBOUYEH, MASOUMEH AZIMIRAD, MOHAMMAD MEHDI ASLANI, and MOHAMMAD REZA ZALI, “ASSOCIATION OF TCDA+/TCDB+ CLOSTRIDIUM DIFFICILE GENOTYPE WITH EMERGENCE OF MULTIDRUG-RESISTANT STRAINS CONFERRING METRONIDAZOLE RESISTANT PHENOTYPE,” IRANIAN BIOMEDICAL JOURNAL, vol. 19, no. 3, pp. 143–148, 2015, [Online]. Available: https://sid.ir/paper/277338/en

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