The data covered 72% of the population of Réunion Island. Over the surveillance period, 11,048,739 consultations were recorded with an average of 82,453 consultations per week (min: 56,682; max: 120,432). An illustration of the results obtained with the historical limit method is presented in Fig. 1 . The first alarms that occurred on week 34 to week 36 of 2009 corresponded to the influenza A(H1N1) epidemic with a peak in week 35. Statistical alarms observed on week 8 of 2010, and week 7 to 9 of 2011 were related to the season circulation of respiratory syncytial virus. These results were confirmed by the laboratory data. During the austral winter of 2010, one alarm was obtained in week 39 corresponding to the influenza epidemic.