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Asynchrony in timing of influenza (flu) activity and birth patterns across Denmark. The influenza epidemic struck Copenhagen (Cph) 1–2 months before it hit the rural areas in Denmark. The delayed effect is mirrored by the birth depression, with the birth rate at its lowest in Copenhagen 1–2 months prior to the low point in rural Denmark. The shaded area represents the 95% confidence interval, which happened to be the same for Copenhagen and rural Denmark.
