This small book is a guide primarily aimed at Medical students and, to a lesser extent, Biology and Mathematics students, because both biologists and mathematicians have a much broader field in this area.

It is a small and simplified part of the theory of dynamical systems and Mathematical Biology, dealing with issues of population multiplication of microorganisms that affect human health.

Dynamical systems, a process of predicting phenomena over time, is a subject of applied mathematics. Basic elements of Mathematics are provided only as much as necessary for understanding the processes and the possibility of applying modeling when needed.

This is a book that simply introduces dynamical systems in biology, allowing us to predict the evolution of biological (and not only) problems.