IAEMSC Pan Flu Reference Sheet

Pandemic: A Worldwide Outbreak of Influenza

• IAEMSC
• 2009 Apr 28

A pandemic is a global disease outbreak. A flu pandemic occurs when a new influenza virus emerges for which people have little or no immunity, and for which there is no vaccine. The disease spreads easily person-to-person, it causes serious illness, and can sweep across the country and around the world in very short time. Influenza pandemics differ from annual influenza outbreaks. The latter are caused by influenza strains that already circulate among people, while pandemics are caused by strains to which the living have not been exposed.

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