STAPHYLOCOCCUS WARNERI CLINICAL ISOLATE SUSCEPTIBILITY TO ANTIBIOTICS AND ITS MODIFICATION BY EMOXYPINE
DOI:
https://doi.org/10.11603/ijmmr.2413-6077.2020.1.10893Keywords:
S. warneri, susceptibility, antibiotics, 2-ethyl-6-methyl-3-hydroxypyridine (emoxypine)Abstract
Background. S. warneri is a common commensal organism, but it can cause serious infections. One of the ways to increase a susceptibility of this microorganism to antibiotics is their combining with adjuvant remedies.
Objectives. The aim of the research is to study the susceptibility of S. warneri clinical isolate to antibiotics and its modification by emoxypine - 2-ethyl-6-methyl-3-hydroxypyridine hydrochloride.
Methods. Samples of purulent wound exudation were obtained from a patient with infective complications after a bone fracture and osteosynthesis by metal plates. Susceptibility of S. warneri clinical isolate to antibiotics and their combinations with emoxypine (1000 μg/disk) was studied by a standard disc diffusion technique. In the case of microbial resistance, the susceptibility of the investigated isolate to such antibiotic was determined by a serial broth dilutions method without or with emoxypine and evaluated according to the minimum inhibitory concentration (MIC).
Results. By the disk diffusion method, S. warneri isolate was susceptible to all tested antibiotics, except chloramphenicol. The growth inhibition zones also were formed around disks containing emoxypine, but the susceptibility of S. warneri to this agent was low. Applying of emoxypine on the disks with antibiotics resulted in the increase of S. warneri growth inhibition in all cases, except using the amikacin, gentamicin, and fusidic acid. The most significant changes were evidenced for a composition chloramphenicol / emoxypine. Using chloramphenicol alone in the liquid medium, the MIC was over a cut-off point. Adding of emoxypine (209 μg/ml) decreased the MIC of the antibiotic and restored the susceptibility S. warneri to chloramphenicol.
Conclusions. The susceptibility of S. warneri clinical isolate to antibiotics can be increased by combining with emoxypine, which among other overcomes the resistance of the studied microorganism to chloramphenicol.
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