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1918 Pandemic (H1N1 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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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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2009: The H1N1pdm09 virus

In the spring of 2009, a novel influenza A (H1N1) virus emerged. It was detected first in the United States and spread quickly across the United States and the world. 

This new H1N1 viru...

The 2009 H1N1 outbreak in numbers

From April 12, 2009 to April 10, 2010, CDC estimated there were 60.8 million cases (range: 43.3-89.3 million), 274,304 hospitalizations (range: 195,086-402,719), and 12,469 deaths (range: 8868-18,306) in the United States due to the (H1N1)pdm09 virus.
Additionally, CDC estimated that 151,700-575,400 people worldwide died from (H1N1)pdm09 virus infection during the first year the virus circulated.

The 2009 H1N1 Pandemic

Though the 2009 flu pandemic primarily affected children and young and middle-aged adults, the impact of the (H1N1)pdm09 virus on the global population during the first year was less severe than that of previous pandemics.
The (H1N1)pdm09 virus was very different from H1N1 viruses that were circulating at the time of the pandemic. Few young people had any existing immunity (as detected by antibody response) to the (H1N1)pdm09 virus, but nearly one-third of people over 60 years old had antibodies against this virus, likely from exposure to an older H1N1 virus earlier in their lives.

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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We remain vulnerable

We remain vulnerable

For all our advances in medicine, we remain more vulnerable to pandemics than we would like to believe.

To understand our vulnerability and to establish what steps we need to take to end ...

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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