Introduction: The aim of the study is to evaluate prevalence of Staphylococcus aureus in a youth population. This samples will be connected to other possible riskfactors for Staphylococcus aureus carriage. Aim: Samples will be tested for methicillin-sensitive (MSSA) and methichillin-resistent Staphylococcus aureus. Samples:Microbiological samples from anterior nares and throat from the protocol "Protocol for sampling and transport of nose- and thoratsamples in the Fit Futures study (DOI: dx.doi.org/0.17504/protocols.io.zaqf2dw).