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Prevalence of three viruses in 144 Mallards followed over time at Ottenby in 2011. (A) Population prevalence of each virus (solid lines) with 95% confidence intervals (dashed lines) for days the Julian days 250–347. Model selection parameters are presented in Tables A.3–A.5. (B) Number of co-infection events, plotted from Julian day 290 to 335. There were 2 co-infection events prior to day 290.
