  We address the existence of periodic orbits for periodic eco-epidemiological
system with disease in the prey. To do it, we consider three main steps.
Firstly we study a one parameter family of systems and obtain uniform bounds
for the components of any periodic solution of these systems. Next, we make a
suitable change of variables in our family of systems to establish the setting
where we are able to apply Mawhin's continuation Theorem. Finally, we use
Mawhin's continuation Theorem to obtain our result. Later on, we present two
examples that include previous results in the literature and some numerical
simulations to illustrate our results.
