launched in 1988 by the World Health Organization, Rotary International, the Centers for Disease Control and Prevention (CDC), and the United Nations Children's Fund (UNICEF), this global effort to eradicate polio involves strengthening routine immunisation services, national immunisation days (NIDs), and other campaigns that provide supplemental oral polio vaccine to all children under age 5. The GPEI website offers details about the global polio situation, as well as various publications and resources on polio.