Fig. 2

Mean Enterococcus spp. enumerations in log colony forming units/sampling area for CE (dark grey bars) and control units (light grey bars). At each sampling moment (a) and per round (b), 135 and 180 samples were taken per unit type, respectively. Significant differences between sampling moments or rounds within one type of unit are indicated by different letters above bars. Significant differences between protocols within one sampling moment or round are indicated by a star (*) on the horizontal axis. Vertical bars denote standard errors. BC; before cleaning, AC/AD, after cleaning (CE unit) or after disinfection (control unit); W1, after 1 week of production and W5: after 5 weeks of production