Fig. 1

Timeline of nasal screening sampling, environmental sampling, and retrospective collection of S. aureus positive clinical cultures. Included patients refers to patients who participated in nasal sampling. Arrows indicate the 17 sampling moments of the environment, the two arrows above indicate sampling moments in the old building, arrows below indicate sampling moments in the new building. Dark grey indicates the timeline for samples related to included patients, light grey indicates the timeline for samples related to the hospital environment