Objective: To describe the microorganisms present on surface areas of surgical rooms, in a medium-sized hospital in Sao Paulo state (Brazil). Materials and method: Sixty samples were collected with the aid of sterile swabs soaked in peptone water and rubbed into quadrants of 20 cm 2 . The surfaces investigated were: medication tables, surgical tables, marble countertops and air conditioning grilles. Results: Staphylococcus aureus, coagulase negative, was the microorganism most frequently found on the surgical tables and on the medication tables (50.7% of the samples). This microorganism is also the most frequent cause of post-surgical infection at the same hospital. Conclusions: Prophylactic measures should include proper hand washing, the use of personal protective equipment, appropriate uniforms, and cleaning and sterilization of surface and medical and hospital equipment.Infección adquirida en el hospital; Enfermería; Microbiología Caracterización microbiológica de la contaminación de la superficie de áreas del quirófano en un hospital de Sao Paulo (Brasil) ResumenObjetivo: Describir los microorganismos presentes en las superficies del área de quirófanos de un hospital de tamaño medio en el estado de Sao Paulo (Brasil). Materiales y métodos: Se recolectaron y cultivaron 60 muestras con la ayuda de hisopos estériles en agua peptonada y aplicadas sobre cuadrantes de 20 cm 2 .Health-care associated infections 131 fueron: tabla de medicamentos, mesa operatoria, terminaciones de mármol de la sala y grillas del aire acondicionado. Resultados: El organismo aislado de manera más frecuente fue Staphylococcus aureus coagulasa negativa y se encontró sobre la mesa operatoria y en la mesa de drogas (50,7% de las muestras). Este es el microorganismo reportado como la causa más frecuente de infecciones post-quirúrgicas en el mismo hospital. Conclusiones: Las medidas profilácticas deben incluir un apropiado lavado de manos, uso de equipo personal protector y limpieza y esterilización del equipo médico y hospitalario y de las superficies de trabajo.
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