VANCOMYCIN SENSITIVITY OF METHICILLIN RESISTANT STAPHYLOCOCCUS AUREUS (MRSA) ISOLATES COLLECTED FROM CLINICAL SPECIMENS OF TABRIZ IMAM REZA AND SINA HOSPITALS BY E-TEST METHOD, AGAR SCREENING PLATE AND PCR

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BOHLOULI PEYMAN; NAHAEI MOHAMMAD REZA; FARAJNIA SAFAR; VARSHOCHI MOJTABA; GHOJAZADEH MORTEZA; AKBARI DIBAVAR MOHAMMAD; SAFAEYAN FIROUZEH

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Journal: IRANIAN JOURNAL OF MEDICAL MICROBIOLOGY Year:2016 | Volume:10 | Issue:1 Page(s): 66-75

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Title

VANCOMYCIN SENSITIVITY OF METHICILLIN RESISTANT STAPHYLOCOCCUS AUREUS (MRSA) ISOLATES COLLECTED FROM CLINICAL SPECIMENS OF TABRIZ IMAM REZA AND SINA HOSPITALS BY E-TEST METHOD, AGAR SCREENING PLATE AND PCR

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Keywords

METHICILLIN- RESISTANT STAPHYLOCOCCUS AUREUSQ2

VANCOMYCINQ2

E-TESTQ2

DRUG SCREENING ASSAYSQ2

PCRVQ2

Abstract

Background and Aim: VANCOMYCIN is one of the last drugs used by human for treatment of infections caused by Methicillin resistant Staphylococcus aureus (MRSA) isolates. Since s. aureus with heterogeneous, intermediate and complete resistance to VANCOMYCIN are in relation to high mortality rate and are increasing in the world, so investigating the incidence of these isolates is necessary.Materials and Methods: By using several phenotypic tests such as Gram stain, catalase, coagulase, DNase and mannitol fermentations and by screening resistance to methicillin, 100 MRSA isolates were identified. For identifying resistance to VANCOMYCIN, phenotypic tests with the disc diffusion method, determining MIC by E-TEST method and screening test in BHIA (Brain Heart Infusion Agar) containing VANCOMYCIN and molecular PCR test were carried out in order to identify femB, mecA and vanA genes.Results: Resistance to methicillin was 59%. Ranges of VANCOMYCIN MICs were between 0.75 mg/ml to 4 mg/ml. By E-TEST method 92% of isolates were sensitive and 8% showed heterogeneous resistance to VANCOMYCIN. However, screening tests in BHIA, containing 3 mg/ml and 4 mg/ml VANCOMYCIN, detected 18% heterogeneous resistance and 4% intermediate resistance to VANCOMYCIN, respectively. In screening tests using BHIA, with 6 mg/ml VANCOMYCIN no isolate was able to grow. Although all of the isolates contained femB and mecA genes, but none of them contained vanA gene.Conclusions: E-TEST alone was not able to identify all S.aureus isolates of heterogeneous resistance and intermediate resistance to VANCOMYCIN. As a result, the screening tests also should be used along with MIC tests.

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APA: Copy

BOHLOULI, PEYMAN, NAHAEI, MOHAMMAD REZA, FARAJNIA, SAFAR, VARSHOCHI, MOJTABA, GHOJAZADEH, MORTEZA, AKBARI DIBAVAR, MOHAMMAD, & SAFAEYAN, FIROUZEH. (2016). VANCOMYCIN SENSITIVITY OF METHICILLIN RESISTANT STAPHYLOCOCCUS AUREUS (MRSA) ISOLATES COLLECTED FROM CLINICAL SPECIMENS OF TABRIZ IMAM REZA AND SINA HOSPITALS BY E-TEST METHOD, AGAR SCREENING PLATE AND PCR. IRANIAN JOURNAL OF MEDICAL MICROBIOLOGY, 10(1), 66-75. SID. https://sid.ir/paper/132603/en

Vancouver: Copy

BOHLOULI PEYMAN, NAHAEI MOHAMMAD REZA, FARAJNIA SAFAR, VARSHOCHI MOJTABA, GHOJAZADEH MORTEZA, AKBARI DIBAVAR MOHAMMAD, SAFAEYAN FIROUZEH. VANCOMYCIN SENSITIVITY OF METHICILLIN RESISTANT STAPHYLOCOCCUS AUREUS (MRSA) ISOLATES COLLECTED FROM CLINICAL SPECIMENS OF TABRIZ IMAM REZA AND SINA HOSPITALS BY E-TEST METHOD, AGAR SCREENING PLATE AND PCR. IRANIAN JOURNAL OF MEDICAL MICROBIOLOGY[Internet]. 2016;10(1):66-75. Available from: https://sid.ir/paper/132603/en

IEEE: Copy

PEYMAN BOHLOULI, MOHAMMAD REZA NAHAEI, SAFAR FARAJNIA, MOJTABA VARSHOCHI, MORTEZA GHOJAZADEH, MOHAMMAD AKBARI DIBAVAR, and FIROUZEH SAFAEYAN, “VANCOMYCIN SENSITIVITY OF METHICILLIN RESISTANT STAPHYLOCOCCUS AUREUS (MRSA) ISOLATES COLLECTED FROM CLINICAL SPECIMENS OF TABRIZ IMAM REZA AND SINA HOSPITALS BY E-TEST METHOD, AGAR SCREENING PLATE AND PCR,” IRANIAN JOURNAL OF MEDICAL MICROBIOLOGY, vol. 10, no. 1, pp. 66–75, 2016, [Online]. Available: https://sid.ir/paper/132603/en

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