Fig. 3

CFUs per 10 cm2 surface, appearing on R2A after 72 h incubation at 32 °C. a Mean CFU values (y-axis), whereas different sampling locations within one module were grouped for each sampling event (x-axis). b The mean CFU values (y-axis) of all sampling events for each sampling location (x-axis). c The CFU values (y-axis) from a representative sample location (dining table, location 6) for each sampling event (x-axis)