The differential transform method is one of the approximate methods which can be eas-
ily applied to many linear and nonlinear problems and is capable of reducing the size of
computationalwork. Exact solutions can also be achieved by the known forms of the series
solutions. In this paper, we present the definition and operation of the one-dimensional
differential transform and investigate the particular exact solutions of system of ordinary
differential equations that usually arise inmathematical biology by a one-dimensional dif-
ferential transformmethod. The numerical results of the presentmethod are presented and
compared with the exact solutions that are calculated by the Laplace transform method