FIGURE 3.

Separating ‘before AMU’ and ‘after AMU’ arms in all the disease episodes. In this example, the horizontal arrows show the first 2 (top) and the last (bottom) flocks of the data set. Each flock starts on the left end and ends on the right end of the arrow, and the length of the arrow is the duration of the flock. Coloured sections represent disease episodes as identified on Figure 2. The red rectangles represent the first week of AMU (if any) in the disease episodes. Sometimes, there is no AMU at all during the disease episode (as on the third episode of the first flock), and some other times, the first week of AMU is the first week of the episode (as on the second episode of the second flock or the first episode of the last flock). Once these first weeks of AMU are identified in all the disease episodes, we gathered, from all the disease episodes of all the flocks, all the weeks that occur before (in blue) in one arm ‘before’, and all the weeks that occur after (in green) these first weeks of AMU in another arm ‘after’