What makes a disease a pandemic? include an example.

A pandemic is the worldwide spread of a new disease. An influenza pandemic occurs when a new influenza virus emerges and spreads around the world, and most people do not have immunity. Viruses that have caused past pandemics typically originated from animal influenza viruses

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Pandemic means diseases that spread over a large area and affect large numbers of people.

One example:
An influenza pandemic occurs when a new influenza virus emerges and spreads around the world, and most people do not have immunity. 

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