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World Health Organization
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Vaccination program led by the World Health Organization World map showing World Health Organization membership: most countries in blue as member states, United States and a few others in orange as withdrawing, yellow for nonmembers, and green for observer status.
Gloved hands draw liquid from a vial into a syringe, overlaid on a digitally colored microscopic image of a virus with round particles in clusters.
World Health Organization Margaret Chan, 2016 last known case of smallpox
At a Glance
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World Health Organization summary
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World Health Organization: Media

UN public health agency
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Videos

How We Develop New Vaccines
Worried about diphtheria? No? Thank vaccines.
Video: Encyclopædia Britannica, Inc.

Images

Vaccination program led by the World Health Organization
World Health Organization workers preparing vaccinations in Mariscal Estigarribia,...
PAHO/World Health Organization
World Health Organization
Workers with the World Health Organization distribute mosquito nets in a Cambodian...
S. Hollyman/World Health Organization
Margaret Chan, 2016
Director general of the World Health Organization Margaret Chan speaking during a...
© Albin Lohr-Jones/Pacific Press—LightRocket/Getty Images
last known case of smallpox
Ali Maow Maalin, who contracted the world's last known case of smallpox, in Merka,...
Centers for Disease Control and Prevention

Interactives

Members of the World Health Organization
Interactive map showing current members of the World Health Organization.
Encyclopædia Britannica, Inc.
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