Figure 3From: Validity and timeliness of syndromic influenza surveillance during the autumn/winter wave of A (H1N1) influenza 2009: results of emergency medical dispatch, ambulance and emergency department data from three European regions Time series of Spanish syndromic surveillance and reference data and documentation of Poisson CUSUM signals, week 36 (30.8.) to 52 (31.12.) in 2009. ED-ES: Emergency department, University Hospital Marqués de Valdecilla, Santander, Autonomous Region Cantabria, Spain.Back to article page