The Health Alert Network (HAN) is an emergency notification system for public health, health care, and emergency response personnel. The HAN is part of a national initiative launched by the Centers for Disease Control and Prevention (CDC) in 1999.

The Philadelphia Department of Public Health uses the HAN to deliver time-critical, health-related information to healthcare professionals. HAN messages issued by the Philadelphia Department of Public Health (PDPH) may be developed by PDPH, the Pennsylvania Department of Health, or the Centers for Disease Control and Prevention (CDC). HAN messages are sent via e-mail and fax to registered users based on medical speciality or area of expertise (Click here to register to receive HAN messages). Health alerts and related information are also accessible on the HIP.

HAN messages are designated by their level of urgency:


 Alert Conveys the highest level of importance; warrants immediate action or attention.
 Advisory Provides important information for a specific incident or situation; may not require immediate action.
 Notification  Provides information regarding an incident or situation; unlikely to require immediate action.
 Update Provides updated information regarding an incident or situation; unlikely to require immediate action.