Srpski arhiv za celokupno lekarstvo 2013 Volume 141, Issue 5-6, Pages: 349-353
https://doi.org/10.2298/SARH1306349C
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Nasal carriage of methicillin-resistant Staphylococcus aureus among medical students of Belgrade University
Ćirković Ivana (Medicinski fakultet, Institut za mikrobiologiju i imunologiju, Beograd + Klinički centar Srbije, Služba za mikrobiologiju, Beograd)
Đukić Slobodanka (Medicinski fakultet, Institut za mikrobiologiju i imunologiju, Beograd)
Vuković Dragana (Medicinski fakultet, Institut za mikrobiologiju i imunologiju, Beograd)
Stevanović Goran (Klinički centar Srbije, Klinika za infektivne i tropske bolesti, Beograd)
Švabić-Vlahović Milena (Klinički centar Srbije, Služba za mikrobiologiju, Beograd)
Stepanović Srđan (Medicinski fakultet, Institut za mikrobiologiju i imunologiju, Beograd)
Introduction Infections caused by methicillin-resistant Staphylococcus aureus
(MRSA) present the growing problem in the whole world. Carriage of MRSA is
most frequent in the nose, and medical students come in contact both with
patients and different persons in the community. Therefore, they may be
significant for the transmission of MRSA from hospitals to out- of-hospital
communities and vice versa. Objective. The aim of this study was to establish
the carriage rate among students of the second, third and fourth year of
study at the School of Medicine in Belgrade and to analyze their genotypic
and phenotypic characteristics. Methods. In total 533 nasal samples were
taken. The samples were incubated in Trypcase-soy broth supplemented with
6.5% NaCl, and thereafter the swabs were inoculated on mannitol salt agar
supplemented with 2 µg/mL of oxacillin. The presence of nuc, mecA and
Panton-Valentine leukocidin genes was examined by PCR. The characteristics of
the MRSA strains were determined using: antibiotic susceptibility testing by
Vitek2 System, SCCmec, agr typing and MLST. Results. MRSA was isolated from
two of 533 investigated samples (0.37%). MRSA were isolated from the students
of the second and third year of study. Profiles of strains were: ST80 (SCCmec
type IV, agr type 3) and ST152 (SCCmec type V, agr type 1). MRSA strains were
multiresistant. Conclusion. The nasal carriage rate of MRSA in population of
medical students of the first year of study in Belgrade is low. Genotypic and
phenotypic characteristics of MRSA strains indicate their community origin.
MLST typing revealed that isolates belong to ST80 and ST152.
Keywords: carriage, methicillin-resistant Staphylococcus aureus, medical students
Projekat
Ministarstva nauke Republike Srbije, br. ON175039