Fig. S1. Seasonal variation in prevalence of mycoplasmal conjunctivitis in three regions illustrating the bimodal variation: peaks are reached in late summer/fall, and in late February/early March, while minimal values are observed in December and during the breeding season (from Altizer, Hochachka & Dhondt 2004b).

Fig. S2. A picture of the large aviary systems used in this experiment. Each flock of birds had access to two octagonal cages connected by a corridor.

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