United Nations Population Information Network
A guide to population information on UN system web sites

World Health Organization (WHO)

The world's authority in matters of public health. Assists national health authorities in planning and carrying out immunization campaigns. Works with donor agencies raising funds for such activities. Promotes and co-ordinates the development of new vaccines.

Statistical Information System
  Describes and to the extent possible provide access to statistical and epidemiological data and information at WHO and elsewhere in electronic or other forms. Most WHO technical programmes make information available to the public. (About the WHOSIS)
  Provides links to various WHO publications, including the WHO Publications Catalogue. Includes alphabetical lists of subjects covered and titles.