Nasal carriage of Staphylococcus aureus and Candida species in immunocompetent individuals

NASTRI ML; HECHT P; NASTRI N; JEWTUCHOWICZ V; CUESTA A; ESTRUGO J; GUALTIERI A; SORDELLI DO; ROSA A

ACTA ODONTOLOGICA LATINOAMERICANA : AOL.

Argentine Division of the International Association for Dental Research.

Lugar: Buenos Aires; Año: 2012 vol. 25 p. 324 - 329

0326-4815

The aim of this study was to analyze the prevalence of Staphylococcus aureus and Candida species in samples of nasal mucosa from 100 immunocompetent subjects of both sexes, aged 18-70 years, during stomatological clinical examination. Samples were taken from the mucosa of both nasal fossae using sterile swabs.Samples were observed fresh, stained with Gram and Giemsa, and cultured on selective differential media at 37ºC to isolate and identify the selectedmicroorganisms; conventional biochemical tests and commercial equipment and molecular studies using PCR were performed.  A digital thermometer-hygrometer was used to measure room temperature at the time of sampling, which was on average 25±2o C, with relative ambient humidity 66±11%. S. aureus was isolated from 38% of the samples; 4% of the sampleswere methicillin-resistant (MRSA) strains, with 2% identified genetically as community-acquired (CA-MRSA) and 2% as hospital-acquired (HA-MRSA).  Candida was identified in 23% of the samples, with prevalence of C. albicans (19%) followed by C. dubliniensis (3%) and C. krusei (1%). There was significant association between Candida and S. aureus (Chi-squared = 27.75; df = 1; (p<0.001).  The nasal cavity is a reservoir and the identification of genus and species contributes to adequate epidemiological surveillance.