FIG 3.

Monthly variation relative to the mean of the expected concentrations of NoV GI (black line; log₁₀ gc/liter), NoV GII (blue line; log₁₀ gc/liter), and MSCs (solid red line; log₁₀ number of PFU per liter) in WWTP influent and monthly variation relative to the mean log₁₀ reduction of MSCs (red dashed line; log₁₀ number of PFU per liter) predicted by the model. Circles represent the medians of the posterior distributions, while segments represent the 95% CIs of the posterior distributions. As an example, the MSC mean log₁₀ reduction was significantly lower (the month effect is positive) than the average from February to June and significantly higher than the average from August to December.