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Measles cases are on the rise globally and here in Illinois the number is increasing as well. Vaccines are 97% effective in preventing this highly contagious disease.  To learn more about this infection and get information on vaccination, go to  Learn how to identify measles and the safe and effective vaccine that can prevent this potentially life-threatening infection for adults and children. 

Health Alert Network - HAN/SIREN

The Health Alert Network, HAN/SIREN, provides the tools and capacity for rapid, reliable, and secure web-based alerting as well as communication and organization-based health information sharing and collaboration.  Siren is the emergency planning, alerting, and notification system for IDPH.  It serves as a single central point for finding, creating, and sharing information.  It also provides emergency preparation for federal, state and local offices.  In short, SIREN is an all hazards approach to emergency preparedness, response, outbreak notification and investigation, and recovery.  

The mission of the HAN is to provide rapid and effective communication to local health departments (LHDs), hospitals, and other public health partners of terrorism/emergency readiness, general public health, infectious disease/immunizations, prevention/promotion, education/training/exercises/drills, and emergency management.

The main components of the HAN are the alert/notification systems, the secure web portal, and HAN/SIREN support and technical services. 

  1. The HAN alert/notification system provides for emergency and routine communications and information sharing between the Department, LHDs, Hospitals and Public Health Partners.
  2. The , the HAN secure web portal, provides the mechanism for controlled role based access to required applications (such as disease reporting and hospital surge capacity), user communities, data sharing and critical secure information. 
  3. End user assistance and support is provided to LHDs, hospitals, IDPH and other partners to enhance related IT infrastructure, computer application and communications capabilities.
  4. Services, tools and support are provided by the HAN/SIREN Team which is composed of IT specialists and developers who are committed to constant maintenance, expansion and improvement of the system.  Portal tools/applications and alert/notification services are available 24/7/365 through web portal access and by notification to designated on-call HAN Team members for alerting services.  Email for all your SIREN needs.

HAN Alert Systems

The HAN’s alert/notification system currently serves over 100 distinct target groups including IDPH programs such as Preparedness and Response, EMS, Infectious Disease, all Local Health Departments, all Hospitals, Labs, Infection Control Practitioners, Contagious Disease Specialists, Illinois Medical Emergency Response Teams and many other public health partners, associations, and partner state agencies.  New contact groups are continuously added.