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2009 H1N1 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 virus contained a unique combination of influenza genes not previously identified in animals or people.
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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.
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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.
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Epidemic vs. pandemic
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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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Spreading of diseases
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430 B.C.: Plague of Athens
The earliest recorded pandemic happened during the Peloponnesian War. It passed through Libya, Ethiopia, and Egypt, and it reached Athens as the Spartans laid siege. Two-thirds of the population died.
The disease, suspected to have been typhoid fever, weakened the Athenians significantly and played a big role in their defeat by the Spartans.
165 A.D.: The Antonine Plague
It may have been an early appearance of smallpox that began with the Huns.
The Huns then infected the Germans, who passed it to the Romans and then returning troops spread it throughout the Roman empire. This plague continued until about 180 A.D., claiming Emperor Marcus Aurelius as one of its victims.
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Flattening the curve
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Preventing system overload
Staying home during the pandemic helps prevent health systems from being overloaded.
Overloading hospitals can likely be averted with protective measures like closing schools, canceling mass gatherings, working from home, self-quarantine, self-isolation, avoiding crowds. All these keep the virus from spreading fast.