Influenza is caused by a virus that causes acute infections of the respiratory tract and is easily transmitted, causing frequent small outbreaks and occasional worldwide pandemics. The first recorded epidemic was in Italy, Germany, and England in 1173. This was relatively mild, but the oubreak in 1580 resulted in thousands of deaths daily at its peak. The term "influenza" has been used since a European outbreak in 1743. The term is of Italian origin and suggest that the star influence its outbreaks astrologically.

Influenza in various forms has been a feature of American life since the colonists arrived in the New World. The first documented outbreak was in 1647, attacking Indians along with Dutch and English colonists. After the Revolution, an outbreak of influenza was described by Benjamin Rush. "Buying and selling," wrote Rush, "were rendered tedious by the coughing of the farmer and the citizen who met in market places."

Nothing, however, prepared the United States or the world for that matter for the pandemic of 1918-1920, which in a matter of four months killed more people than had died in all of World War I. It was first noted in the United States in January 1918. On March 4, it struck Fort Riley, Kansas, and in a week had put 100 men in hospital and had reached Queens, New York.

The name "Spanish flu" is most likely due to the relatively unfettered press in Spain, which was neutral in the world war. The ravages may have been equal or greater elsewhere, but the headlines came out of Spain, which acquired the name.

Before it abated, the influenza infections reached remote Pacific islands and even the Arctic. A wide range of estimates has been given for the worldwide toll, ranging from 30 to 130 million. Unlike most influenza attacks, the 1918 outbreak affected young people in their prime to an unusual degree.

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The Great Influenza: The Story of the Deadliest Pandemic in History by John M. Barry.
At the height of WWI, history’s most lethal influenza virus erupted in an army camp in Kansas, moved east with American troops, then exploded, killing...
Savage Peace: Hope and Fear in America, 1919 by Ann Hagedorn.
Written with the sweep of an epic novel and grounded in extensive research into contemporary documents, Savage Peace is a striking portrait of America...
Flu: The Story Of The Great Influenza Pandemic by Gina Kolata.
Feeling tired, achy, and congested? You'll hope not after reading science writer Gina Kolata's engrossing Flu, a fascinating look at the 1918 epidemi...