Authors:

You can have an epidemic in a state. You can have it in a region. You can have it in a country where the critical level of disease passes a certain threshold and we call that an epidemic threshold.

"H5N1 - Killer Flu". "Wide Angle" with Bill Moyers, www.pbs.org. September 20, 2005.
You can have an epidemic in a state. You can have it in a region. You can have it in a country where the critical level of disease passes a certain threshold and we call that an epidemic threshold.