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Medicinski pregled
2011, vol. 64, iss. 11-12, pp. 613-617
article language: Serbian
document type: Professional Paper

Markers of antimicrobial drug resistance in the most common bacteria of normal facultative anaerobic intestinal flora
The affiliation is not available

e-mail: teodora.plavsic@gmail.com

Abstract

Introduction. Bacteria of normal intestinal flora are frequent carriers of markers of antimicrobial drug resistance. Resistance genes may be exchanged with other bacteria of normal flora as well as with pathogenic bacteria. The increase in the number of markers of resistance is one of the major global health problems, which induces the emergence of multi-resistant strains. The aim of this study is to confirm the presence of markers of resistance in bacteria of normal facultative anaerobic intestinal flora in our region. Material and methods. The experiment included a hundred fecal specimens obtained from a hundred healthy donors. A hundred bacterial strains were isolated (the most numerous representatives of the normal facultative- anaerobic intestinal flora) by standard bacteriological methods. The bacteria were cultivated on Endo agar and SS agar for 24 hours at 37ºC. Having been incubated, the selected characteristic colonies were submitted to the biochemical analysis. The susceptibility to antimicrobial drugs was tested by standard disc diffusion method, and the results were interpreted according to the Standard of Clinical and Laboratory Standards Institute 2010. Results. The markers of resistance were found in 42% of the isolated bacteria. The resistance was the most common to ampicillin (42% of isolates), amoxicillin with clavulanic acid (14% of isolates), cephalexin (14%) and cotrimoxazole (8%). The finding of 12 multiresistant strains (12% of isolates) and resistance to ciprofloxacin were significant. The frequency of resistance markers was statistically higher in Klebsiella pneumoniae compared to Escherichia coli of normal flora. Discussion and conclusion. The finding of a large number of markers of antimicrobial drug resistance among bacteria of normal intestinal flora shows that it is necessary to begin with systematic monitoring of their antimicrobial resistance because it is an indicator of resistance in the population.

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