http://www.cdc.gov/nip/

This is the main page for the CDC's National Immunization Program (NIP). NIP provides leadership for the planning, coordination, and conduct of immunization activities nationwide (USA). It provides information for the general public, health care professionals, partners, and media. Information is organized by disease, news and events, frequently asked questions, resources, education , guidelines, and software for each user group. A link is provided for spanish language information: CDC en Español - Inmunización. Links are also provided for additional Immunization programs' websites.