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May 30, 2009 3:38 am
When I was in medical school, the difference between epidemic and pandemic was explained as thus:
An epidemic is a disease outbreak which is confined to one country or hemisphere; pandemic referred to a disease which occurred throughout the entire world. Thus, the current H1N1 outbreak does qualify as a pandemic (as did the flu outbreak of 1918). (However, it certainly doesn't seem to be such to me, considering that it is so sporadic, and generally mild.)
Dr. David Evans