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Polio vaccine
A health care worker giving a polio vaccine to a child in Katsina state, Nigeria,...
Alford Williams/Centers for Disease Control and Prevention (CDC)
Kabul: Ministry of Public Health
A worker administers water-purifying tablets for the Ministry of Public Health in...
Tomas Munita/AP
Centers for Disease Control and Prevention
During the 2019–20 coronavirus pandemic, which affected thousands of people in the...
James Gathany/CDC
Black Death
Flagellants in the Netherlands scourging themselves in atonement, believing that...
© Photos.com/Getty Images Plus
Louis Pasteur in his laboratory
In the 19th century Louis Pasteur's work established the germ theory of disease,...
Photos.com/Getty Images
Pasteurized milk
A milk campaign notice (1902) from the Chicago Commons settlement house, which sought...
The Newberry Library, Gifts of Lea Demarest Taylor and Katharine Taylor, 1952 (A Britannica Publishing Partner)
Ebola virus disease; hand washing
A Liberian nurse washing his hands with water after treating a patient sick with...
Bethany Fank—iStock/Thinkstock
Basic reproduction number of select viral diseases
The contagiousness of infectious pathogens is measured by R0 (R naught),...
Encyclopædia Britannica, Inc.
milk campaign notice
A milk campaign notice (1902) from the Chicago Commons settlement house, which sought...
The Newberry Library, Gifts of Lea Demarest Taylor and Katharine Taylor, 1951 (A Britannica Publishing Partner)
Interactives
Members of the World Health Organization
Interactive map showing current members of the World Health Organization.
Encyclopædia Britannica, Inc.
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