The CDC National Prevention Information Network (NPIN) is the U.S. Reference and Referral Service for information on HIV/AIDS, viral hepatitis, sexually transmitted disease (STDs), and tuberculosis (TB). NPIN is a next-generation clearinghouse that collects and disseminates data and materials to support the work of prevention organizations and workers in the international, national, state and local settings. Our services are designed to facilitate program collaboration on sharing information, resources, published materials, research, and trends among the four diseases.