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Marina Spelzini, a registered nurse, measures out an H1N1 vaccine shot at the Miami Dade County Health Department downtown clinic on November 3, 2009 in Miami, Florida. (influenza, swine flu)

When Was the Last Pandemic?

pulmonary veins and arteries, circulation, cardiovascular system, human anatomy, (Netter replacement project - SSC)

13 Questions About How the Human Body Works Answered

People wearing surgical masks (also called face mask or medical masks or safety masks) walk through the city center of Milan, Italy on Feb. 23, 2020. Coronavirus disease COVID-19 pandemic

How Do Face Masks Control the Spread of Disease?

Asian face showing emotion (talking, speaking).

Why Does Your Voice Change as You Age?

Infographic on the Influenza Pandemic of 1918-19

Influenza Pandemic of 1918–19 Chart

Discover

Two chicks near an egg with a white background (poultry, chick, chickens, birds).

What Do Eggs Have to Do with Easter?

Battle of the Alamo from "Texas: An Epitome of Texas History from the Filibustering and Revolutionary Eras to the Independence of the Republic, 1897. Texas Revolution, Texas revolt, Texas independence, Texas history.

6 Wars of Independence

Fish. Lionfish. Lion-fish. Turkey fish. Fire-fish. Red lionfish. Pterois volitans. Venomous fin spines. Coral reefs. Underwater. Ocean. Red lionfish swims by seaweed.

10 of the World’s Most Dangerous Fish

Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

7 of the World’s Deadliest Shipwrecks

Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society

12 Novels Considered the “Greatest Book Ever Written”

Small, white rat (genus Rattus) on a glass table. (rodent, laboratory, experiment)

Cruel and Unusual Punishments: 15 Types of Torture

croup: Related Content

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Topics

trachea larynx epiglottitis childhood disease and disorder viral disease polio bird flu measles diphtheria whooping cough rheumatic fever chickenpox COVID-19 common cold SARS

Quiz

A Yorkshire terrier dressed up as a veterinarian or doctor on a white background. (dogs)

A Visit with the Word Doctor: Medical Vocabulary Quiz

44 Questions from Britannica’s Most Popular Health and Medicine Quizzes

full human skeleton

Diseases, Disorders, and More: A Medical Quiz