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1918 Pandemic (H1N1 virus)

1918 Pandemic (H1N1 virus)

The 1918 influenza pandemic was the most severe pandemic in recent history. It was caused by an H1N1 virus with genes of avian origin.
We don't really know he virus originated, it spread worldwide during. It is estimated that about 500 million people or one-third of the world’s population became infected with this virus.

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1918 Pandemic (H1N1 virus)

1918 Pandemic (H1N1 virus)

https://www.cdc.gov/flu/pandemic-resources/1918-pandemic-h1n1.html

cdc.gov

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Key Ideas

1918 Pandemic (H1N1 virus)

The 1918 influenza pandemic was the most severe pandemic in recent history. It was caused by an H1N1 virus with genes of avian origin.
We don't really know he virus originated, it spread worldwide during. It is estimated that about 500 million people or one-third of the world’s population became infected with this virus.

The 1918 influenza in numbers

The number of deaths was estimated to be at least 50 million worldwide with about 675,000 occurring in the United States.
Mortality was high in people younger than 5 years old, 20-40 years old, and 65 years and older. The high mortality in healthy people, including those in the 20-40 year age group, was a unique feature of this pandemic.

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The Black Death

In 1347, the Black Death came to Europe, first brought by the Mongol army, then spreading through Europe.

In six years, tens of millions fell gravely ill. Nearly half of all Europeans succumb to the Black Death, one-third of Egyptians and Syrians were killed, and it also laid waste to parts of central Asia, India, and China.

Disasters that scarred humanity
  • In AD 541, the plague of Justinian struck the Byzantine empire, killing roughly 3% of the world's population.
  • When Europeans reached the Americas in 1492, the two populations exposed each other to completely novel diseases such as measles, influenza, and smallpox.
  • Centuries later, the interconnected world made a global pandemic possible. The Spanish flu of 1918 spread to six continents where between 3% and 6% were killed.

However, even the Spanish flu pandemic had a minimal apparent effect on the world's development. It was less significant than the first world war, which had a smaller death toll but a more substantial impact on the course of history.

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The influenza pandemic of 1918

It is often referred to incorrectly as the “Spanish flu.” Between 50 and 100 million people are thought to have died, representing as much as 5% of the world’s population. Half a billion people...

The origins of the "Spanish" flu

The so-called Spanish flu did not originate in Spain. The geographic origin of the flu is debated to this day, though hypotheses have suggested East Asia, Europe, and even Kansas.
The influenza pandemic from 1918 got this name most likely because of the WWI context: The major countries involved in the war were keen to avoid encouraging their enemies, so reports of the extent of the flu were suppressed in Germany, Austria, France, the United Kingdom and the U.S. By contrast, neutral Spain had no need to keep the flu under wraps. That created the false impression that Spain was bearing the brunt of the disease.

The end of mankind

The 1918 flu spread rapidly, killing 25 million people in just the first six months. This led some to fear the end of mankind and that the whole thing was caused by a form of super-virus.
Recent studies show that the high death rate can be attributed to crowding in military camps and urban environments, as well as poor nutrition and sanitation, which suffered during wartime.

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Epidemic vs. pandemic

An epidemic is a broad term used to describe any problem that is actively spreading and has grown out of control.

The pandemic rel...

Disease Event Classification

Epidemiology is the branch of medicine that handles the following:

  • Incidence: the occurrence of a disease over a specified period.
  • Prevalence: how many people are affected within a population.
  • Control of diseases: an appropriate public health response.

Two measurable factors mostly define the level of disease occurrence:

  • The pattern and speed by which a disease moves.
  • The size of the susceptible population.
The terms an epidemiologist use
  • Sporadic refers to a disease that occurs infrequently or irregularly.
  • Cluster refers to a disease that occurs in larger numbers even though the actual number or cause may be uncertain.
  • Endemic refers to the constant presence and/or general prevalence of a disease in a geographic population.
  • Hyperendemic refers to persistent, high levels of disease well above what is seen in other populations.
  • Epidemic refers to a sudden increase in the number of cases of a disease above what is normally expected.
  • Outbreak is the same as an epidemic but is often used to describe a more limited geographic event.
  • Pandemic refers to an epidemic that has spread over several countries or continents, usually affecting a large number of people.

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