When was the first case of influenza

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When was the first case of influenza

Hard as it is to believe, the answer is true.

World War I claimed an estimated 16 million lives. The influenza epidemic that swept the world in 1918 killed an estimated 50 million people. One fifth of the world's population was attacked by this deadly virus. Within months, it had killed more people than any other illness in recorded history.

The plague emerged in two phases. In late spring of 1918, the first phase, known as the "three-day fever," appeared without warning. Few deaths were reported. Victims recovered after a few days. When the disease surfaced again that fall, it was far more severe. Scientists, doctors, and health officials could not identify this disease which was striking so fast and so viciously, eluding treatment and defying control. Some victims died within hours of their first symptoms. Others succumbed after a few days; their lungs filled with fluid and they suffocated to death.

The plague did not discriminate. It was rampant in urban and rural areas, from the densely populated East coast to the remotest parts of Alaska. Young adults, usually unaffected by these types of infectious diseases, were among the hardest hit groups along with the elderly and young children. The flu afflicted over 25 percent of the U.S. population. In one year, the average life expectancy in the United States dropped by 12 years.

It is an oddity of history that the influenza epidemic of 1918 has been overlooked in the teaching of American history. Documentation of the disease is ample, as shown in the records selected from the holdings of the National Archives regional archives. Exhibiting these documents helps the epidemic take its rightful place as a major disaster in world history.

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Courtesy of the National Museum of Health and Medicine, Armed Forces Institute of Pathology, Washington, D.C.

The influenza pandemic of 1918–19, also called the Spanish flu, lasted between one and two years.

The pandemic occurred in three waves, though not simultaneously around the globe. In the Northern Hemisphere, the first wave originated in the spring of 1918, during World War I. Although it remains uncertain where the virus first emerged, the earliest cases in the United States were detected in March among military personnel stationed at Camp Funston in Fort Riley, Kansas. Movement of troops probably helped spread the virus throughout the U.S. and Europe during the late spring. By summer the virus had reached parts of Russia, Africa, Asia, and New Zealand. This first wave was comparatively mild and had begun to die down in some areas, but a second, more lethal wave began about August or September 1918. During this wave, pneumonia often developed quickly, with patients usually dying just two days after experiencing the first symptoms of the flu. As social distancing measures were enforced, the second wave began to die down toward the end of November. Once those measures were relaxed, however, a third wave began in the winter and early spring of 1919. Though not as deadly as the second wave, the third wave still claimed a large number of lives. By summer the virus had run its course in many parts of the world, but some historians suggest that there was a fourth wave in winter 1920, though it was far less virulent.

The Spanish flu was the most severe pandemic of the 20th century and, in terms of total numbers of deaths, among the most devastating in human history. Outbreaks occurred in every inhabited part of the world, including islands in the South Pacific. The second and third waves claimed the most lives, with about half the deaths occurring among 20- to 40-year-olds, an unusual mortality age pattern for influenza. India is believed to have suffered at least 12.5 million deaths during the pandemic, and in the United States about 550,000 people died. Some scholars think the total number could be even higher.

This answer was originally published on Britannica’s Beyond.

When was the first case of influenza
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When was the first case of influenza

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