Currently, the risk of influenza infection is low. Influenza viruses are detected throughout the year at low levels and can cause disease. Vaccination is the best way to protect against influenza infection and all Chicagoans aged six months and older are encouraged to get vaccinated, annually. This will be the last Chicago Flu Update issued for the 2015-2016 influenza surveillance season. The next update will be issued in October 2016. CDPH will continue to monitor surveillance indicators throughout the summer months.