Fig. 2.

Box plots showing concentration of fecal indicator bacteria (a–c) and prevalence of Salmonella spp. (d) in slurry and biogas effluent illustrated by season, commune and toilet connected. The concentration of bacteria or spores detected in slurry and biogas effluent is presented as cfu/mL or pfu/mL. The horizontal line within the box shows the median, the box the interquartile range and the whiskers show the adjacent values (i.e. up to 1.5 times the interquartile range below the 25th percentile or above the 75th percentile). Values outside this range are shown by markers.