Figure 3

2-D Discriminant analysis plots of VOCs data sampled in the morning and afternoon from (a) room 1 (increasing C. jejuni prevalence) with one sampler directly installed above C. jejuni-infected and one sampler directly installed above non-infected birds, and (b) samplers directly installed under the exit fan in room 1 and 2. Each point represents sensor data measured at one time point (VOCs). VOCs were measured three times for one sample. One sample was taken twice a day in the morning and in the afternoon on three consecutive days. Points of the same colour/shape indicate one prevalence step which was maintained over three days.