Fig. 2
From: Monitoring sick leave data for early detection of influenza outbreaks
Incidence of influenza-like illness and sick leave and results from Sentinelles and Sick-Leave models. Incidence per 100,000 per week of influenza-like illness and sick leave, 2015–2017, and alerts from the Sentinelles (blue) and the sick-leave (red) models, in three French regions (A: Hauts-de-France, B: Ile-de-France, C: Provence-Alpes-Côte d’Azur). Alerts show as purple when Sentinelles and sick-leave alerts overlap. Christmas and summer school holidays (increased worker leave periods) are shown at the bottom (green)