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Objective  The findings from truly randomized community-based studies on  Staphylococcus aureus  nasal colonization are scarce. Therefore we have examined point prevalence and risk factors of  S. aureus  nasal carriage in a non-hospitalized population of Braunschweig, northern Germany.    Methods  A total of 2026 potential participants were randomly selected through the resident's registration office and invited by mail. They were requested to collect a nasal swab at home and return it by mail.  S. aureus  was identified by culture and PCR. Logistic regression was used to determine risk factors of  S. aureus  carriage.    Results  Among the invitees, 405 individuals agreed to participate and 389 provided complete data which was included in the analysis. The median age of the participants was 49 years (IQR: 39–61) and 61% were females.  S. aureus  was isolated in 85 (21.9%; 95% CI: 18.0–26.2%) of the samples, five of which were MRSA (1.29%; 95% CI: 0.55–2.98%). In multiple logistic regression, male sex (OR = 3.50; 95% CI: 2.01–6.11) and presence of allergies (OR = 2.43; 95% CI: 1.39–4.24) were found to be associated with  S. aureus  nasal carriage. Fifty five different  spa  types were found, that clustered into nine distinct groups. MRSA belonged to the hospital-associated  spa  types t032 and t025 (corresponds to MLST CC 22), whereas MSSA  spa  types varied and mostly belonged to  spa -CC 012 (corresponds to MLST CC 30), and  spa -CC 084 (corresponds to MLST CC 15).    Conclusion  This first point prevalence study of  S. aureus  in a non-hospitalized population of Germany revealed prevalence, consistent with other European countries and supports previous findings on male sex and allergies as risk factors of  S. aureus  carriage. The detection of hospital-associated MRSA  spa  types in the community indicates possible spread of these strains from hospitals into the community.

plos one

Methicillin-Sensitive and Methicillin-Resistant Staphylococcus aureus Nasal Carriage in a Random Sample of Non-Hospitalized Adult Population in Northern Germany