The Health Alert Network (HAN) is a program under the Centers for Disease Control and Prevention which is an agency of the United States Department of Health and Human Services. The HAN project is intended to "ensure that each community has rapid and timely access to emergent health information; a cadre of highly-trained professional personnel; and evidence-based practices and procedures for effective public health preparedness, response, and service on a 24/7 basis."
Currently, HAN is a strong national program, providing vital health information and the infrastructure to support the dissemination of that information at the state and local levels, and beyond. A vast majority of the State-based HAN programs have over 90% of their population covered under the umbrella of HAN. The HAN Messaging System currently directly and indirectly transmits Health Alerts, Advisories, and Updates to over one million recipients. The current system is being phased into the overall PHIN messaging component.
Video Health Alert Network
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Source of the article : Wikipedia