Fig. 3

Box plots describing the severity of M. hyopneumoniae infection (number of pigs per day either acutely or chronically infectious and diseased divided by the number of all pigs per all days in the model) in a batch of 293 pigs, when three protective factors are all absent (Vac[−], Acc[−], Suc[−]) and two risk factors are both present (Con[+], Inf[+]). Values represent results of 1,000 iterations of the stochastic compartment model. The disease severity is a ratio between the number of pigs per day being infectious divided and the number all pigs per day in the model