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Canadian Journal of Infectious Diseases and Medical Microbiology
Volume 2017 (2017), Article ID 5180984, 6 pages
Research Article

In Vitro Susceptibility of Mycobacterium ulcerans Isolates to Selected Antimicrobials

1Department of Medical Laboratory Sciences, School of Biomedical and Allied Health Sciences, University of Ghana, Accra, Ghana
2Department of Medical Microbiology, School of Biomedical and Allied Health Sciences, University of Ghana, Accra, Ghana
3Noguchi Memorial Institute for Medical Research, University of Ghana, Legon, Ghana

Correspondence should be addressed to Enid Owusu

Received 7 January 2017; Revised 17 February 2017; Accepted 23 February 2017; Published 14 March 2017

Academic Editor: Pietro Mastroeni

Copyright © 2017 Enid Owusu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Background. The current definitive treatment of Buruli ulcer with antibiotics makes the issue of antimicrobial drug resistance an unavoidable one. This is as a result of drug misuse by health personnel and patients’ noncompliance to treatment regimen. Monitoring of these factors and screening for new effective antimicrobials are crucial to effective management of Buruli ulcer disease. This study therefore investigated the inhibitory activity of some antibiotics against isolates of Mycobacterium ulcerans. Methods. Activity of eight antibiotics was tested against twelve M. ulcerans isolates (2 reference strains and 10 clinical isolates). The anti-M. ulcerans activities were determined by the agar dilution method and the minimum inhibitory concentrations (MICs) were determined by the agar proportion method. Results. All antimicrobials investigated had activity against M. ulcerans isolates tested. The MICs ranged from 0.16 μg/mL to 2.5 μg/mL. Azithromycin recorded the highest inhibitory activity at a mean MIC of 0.39 μg/mL, whilst clofazimine a second-line antileprosy drug, recorded the lowest at a mean MIC of 2.19 μg/mL. Among the four antituberculosis drugs, rifampicin had the highest activity with a mean MIC of 0.81 μg/mL. Conclusion. Azithromycin could be considered as a lucrative alternative to existing treatment methods for inhibiting M. ulcerans in Ghana.