“…But nowadays, a central concern of epidemiology is to study diseases such as stroke and coronary heart disease, positioning diseases that do not transmit from one person to another as an infectious diseases. These diseases are dominating worldwide spreading infectious disease such as pneumonia, dengue, influenza and HIV (Martcheva, 2013;Pokharel, 2020).Epidemiology is a branch of medical science dealing with disease incidence, distribution and control in a population. It identifies risk factors, assesses treatment and health services modalities, and provides opportunities for the prevention, treatment, planning and improvement of health services effectively.…”