The 317 Coalition was formed in April 2006 by a group of leaders in the immunization community, including non-profit immunization advocacy organizations, academic and provider institutions, professional associations, and vaccine manufacturers. A virtual network led by a steering committee and staffed by a Washington D.C.-based government relations firm, the Coalition has become a resource for member organizations to share data and information about the needs of the Centers for Disease Control and Prevention’s (CDC) national immunization program for advocacy purposes. It is also a vehicle for smaller state and local organizations that lack the capacity to follow Capitol Hill daily to receive free action alerts, talking points, information, and tips on how and when to engage their congressional delegations in support of increased funding for immunization. The Coalition seeks to continually recruit national, state, and local organizations interested in child and adult immunization to expand an effective grassroots advocacy network to as many state and congressional districts as possible. Membership is free to non-profit vaccine organizations. Financial support for the Coalition is provided by Pfizer Inc.