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Public Health Emergency Preparedness

This resource was part of AHRQ's Public Health Emergency Preparedness (PHEP) program, which was discontinued on June 30, 2011, in a realignment of Federal efforts.

This information is for reference purposes only. It was current when produced and may now be outdated. Archive material is no longer maintained, and some links may not work. Persons with disabilities having difficulty accessing this information should contact us at: Let us know the nature of the problem, the Web address of what you want, and your contact information.

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Examples of Two Categories of Mass Casualty Event (MCE)

Figure 1.1. Immediate (Sudden Peak) Impact

Explosions, Airplane or Train Crashes Due to Bombings (e.g., Madrid Train Bombings), Earthquakes

Line graph shows that number of patients following an immediate impact MCE begins high, then decreases sharply over time.

Figure 1.2. Developing (Sustained) Impact

Anthrax, Smallpox, Flu Pandemic

Line graph shows that number of patients following a developing impact MCE begins low, rises sharply into a peak, then decreases over time.

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The information on this page is archived and provided for reference purposes only.


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