End of Winter Surveillance and Start of the Spring SeasonThe arrival of spring gradually marks the end of the epidemic activity of several conditions: influenza, bronchiolitis, acute gastroenteritis, carbon monoxide poisoning, and hypothermia. The corresponding epidemiological surveillance systems, notably the single network and that of the InVS, are scaled back but continue to monitor sporadic events that may still occur.Surveillance of winter illnesses will be the subject of a special Health Surveillance Bulletin to be published by the Cire next fall, presenting an epidemiological summary of the 2014–2015 season. Our weekly epidemiological update thus ceases production of indicators related to winter illnesses. It will, however, continue to provide information on gastroenteritis, which may still have an impact in the spring or summer due to microorganisms other than those circulating during the winter. It will also include surveillance of emergency room visits for allergies that may occur as a result of pollen or air pollutants.