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What is Pandemic Influenza?

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What is Pandemic Influenza?

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An influenza pandemic is a global outbreak of disease that occurs when a new influenza A virus appears or “emerges” in the human population, causes serious illness, and then spreads easily from person to person worldwide.

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A pandemic is a global disease outbreak. An influenza pandemic occurs when a new influenza virus emerges for which there is little or no immunity in the human population, begins to cause serious illness, and then spreads easily person-to-person worldwide.

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Influenza – “flu” – is widely familiar, causing epidemics every year. Influenza viruses spread very well from person to person. A pandemic is an influenza epidemic so large that the entire world is affected. Two main conditions are required for an influenza pandemic: the influenza virus strain must be novel to the human population (so that most of the population does not already have some immunity to), and it must be able to spread efficiently from person to person.

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Influenza – “flu” – is widely familiar, causing epidemics every year. Influenza viruses spread very well from person to person. A pandemic is an influenza epidemic so large that the entire world is affected. Two main conditions are required for an influenza pandemic: the influenza virus strain must be novel to the human population (so that most of the population does not already have some immunity to it), and it must be able to spread efficiently from person to person.

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Pandemic flu occurs when a new flu virus rapidly spreads from country to country around the world, causing a global outbreak of serious respiratory illness that spreads easily from person to person. The swift spread of a pandemic flu happens because people are not immune to the new flu virus, and an effective vaccine would take months to develop. Depending on the nature of the virus, many people could become seriously ill and many people could die. Pandemics are not seasonal. A flu pandemic can happen at any time of year. By contrast, seasonal flu is the usual flu that occurs in the late fall, winter, and early spring.

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