<span>Sometimes a single case of
certain contagious disease is treated as an epidemic. An example of this is
Ebola where it can rapidly spread and can be acquire over a short period of
time. Moreover, an epidemic is define as an occurrence
of more cases of disease in excess of expected levels in a specific group of
people over a period of time. Therefore, the term epidemic involves larger
number of people over a wide geographic area. </span>
