  A cellular automata model that describes as limit cases of his parameters the
spread of contagious diseases modeled by systems of ordinary or partial
differential equations is developed. Periodic features of the behavior of human
settlement are considered. The model is built taking into account the range of
motion of the elements of population. For small (large) values of this range,
the behaviors described by partial (ordinary) differential equation models are
reproduced. Emphasis is done in the study of those scenarios in which the above
mentioned equations fail to describe. Some interesting results in these cases
are reported.
