Pandemic
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A pandemic is an epidemic of an infectious disease that has spread across a large region, for instance multiple continents or worldwide, affecting a substantial number of individuals. Widespread endemic diseases with a stable number of infected individuals such as recurrences of seasonal influenza are generally excluded as they occur simultaneously in large regions of the globe rather than being spread worldwide.
Early in the COVID-19 pandemic, convention centers (pictured here) were deemed to be ideal sites for temporary hospitals, due to their existing infrastructure (electrical, water, sewage). Hotels and dormitories were also considered appropriate because they can use negative pressure technology.
Depiction of the burial of bodies during the Black Death, which killed up to half of Eurasia's population in the 14th century.
American Red Cross workers carry a body during the 1918–20 "Spanish flu" pandemic.
Social distancing in public
World population
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In world demographics, the world population is the total number of humans currently living. It was estimated by the United Nations to have exceeded eight billion in mid-November 2022. It took around 300,000 years of human prehistory and history for the human population to reach a billion and only 222 years more to reach 8 billion.
A world population clock in August 2022 at Eureka! in Halifax, West Yorkshire