Fig. 1.

Study population: S. aureus colonization (single nasal swab culture) and S. aureus carriage (repeated nasal swab culture). ^aParticipants invited; <50 years: all, and ≥50 years: random samples. ^bAntibiotics taken in the last 24 hours before visit: systemic or eye drops/ointments. ^cMedian time between repeated nasal swabs was 31 days