Influence of host genetics and environment on nasal carriage of staphylococcus aureus in danish middle-aged and elderly twins.
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BACKGROUND: Nasal carriage is a major risk factor for Staphylococcus aureus infection. Approximately, one-quarter of adults carry S. aureus. However, the role of host genetics on S. aureus nasal carriage is unknown. METHODS: Nasal swabs were obtained from a national cohort of middle-aged and elderly Danish twins. Subjects colonized with S. aureus were identified by growth on selective plates and spa typing. A second sample was obtained from twins initially concordant for carriage. Twins found to again be colonized with S. aureus were defined as persistent carriers. RESULTS: The prevalence of S. aureus carriage among 617 twin pairs (monozygotic/dizygotic pairs: 112/505) was 26.3% (95% confidence interval [CI], 24.0%-28.9%). The concordance rate for carriage did not differ significantly between pairs of monozygotic (37.5%; 95% CI, 22.3%-53.8%) twins and same sex (24.2%; 95% CI, 15.4%-34.5%), and opposite sex (21.4%; 95% CI, 12.0%-33.4%) dizygotic twins. Despite shared childhoods, only 1 of 617 pairs was concordant with respect to lineage. Although heritability increased for S. aureus and lineage persistency, no significant heritability was detected. CONCLUSION: In this study, host genetic factors exhibited only a modest influence on the S. aureus carrier state of middle-aged and elderly individuals.
Aged, 80 and over
Published Version (Please cite this version)10.1093/infdis/jis491
Publication InfoAndersen, PS; Christensen, Kaare; Fode, P; Fowler, Vance Garrison Jr; Pedersen, JK; Skov, RL; & Stegger, M (2012). Influence of host genetics and environment on nasal carriage of staphylococcus aureus in danish middle-aged and elderly twins. J Infect Dis, 206(8). pp. 1178-1184. 10.1093/infdis/jis491. Retrieved from https://hdl.handle.net/10161/13326.
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Florence McAlister Professor of Medicine
Determinants of Outcome in Patients with Staphylococcus aureus Bacteremia Pathogenesis of Bacterial Infections Infections due to Resistant Gram Positive Organisms Tropical medicine/International Health