Variación del estado de portador de Staphylococcus aureus en una población de estudiantes de medicina

This is a longitudinal study performed in a 159 medicine student’s cohort, of fourth and ninth study semester, in order to evaluate the variation of Staphylococcus aureus carriers and its antimicrobial susceptibility on students, before and after clinical practice. Clinical samples were taken with a swab from the tonsils, pharynx posterior wall, nasal fosses and hands and were cultured in 5% sheep blood and incubated at 37 o C in aerobic conditions during 48 hours. The identification of Sthaphylococcus aureus was performed according to the phenotypic and biochemical test. The antimicrobial susceptibility was evaluated by the diffusion disc method using the Kirby-Bauer technique, according to Clinical and Laboratory Standards Institute (CLSI), with the following antibiotics: Ciprofloxacyn, Vancomycin, Oxacyclin, Cephalotine, Clyndamycin, and Ryphampycin. The average age of the fourth semester students was 19.1± 1,2 years and the female gender was 2/1 more frequent than the male. The history of infections, allergy, smoke habit, non infectious diseases, surgeries, antibiotic use during the last three months and hospitalizations six months before sampling was analyzed. There was no significant relationship between previous history analysis and the carrier state incidence (p=0.001 Mc Nemar exact Test). A significant increase of 15,1% for S. aureus carrier state was observed after three years of exposure to hospital environment on ninth semester students, compared to fourth semester students (p=0.001 Test Mc Nemar); from which 16.4% (p