Reference: The Grolier International Dictionary, Vol. 1. page 440.
EPIDEMIC - spreading rapidly and extensively among many individuals in an area.
said especially of contagious diseases.
Reference: The Grolier International Dictionary, Vol. 2. page 947.
PANDEMIC - widespread. epidemic over an especially wide geographic area.
The swine flu is called pandemic, because it is not confined to only a place, but is spreading in different states/ countries in different continents at almost the same period.
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