Influence of host genetics and environment on nasal carriage of staphylococcus aureus in danish middle-aged and elderly twins.

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • Andersen, PS; Pedersen, JK; Fode, P; Skov, RL; Fowler, VG; Stegger, M; Christensen, K

Published Date

  • October 2012

Published In

Volume / Issue

  • 206 / 8

Start / End Page

  • 1178 - 1184

PubMed ID

  • 22872733

Pubmed Central ID

  • PMC3448969

Electronic International Standard Serial Number (EISSN)

  • 1537-6613

Digital Object Identifier (DOI)

  • 10.1093/infdis/jis491


  • eng

Conference Location

  • United States