EPIDEMOLOGY AND PUBLIC HEALTH

The study of occurance and distribution and control of infectious disease in a population is the part of study of field of epidemiology.

            In nature man’s come in contact with many organism and some of these organism causes disease called pathogens. Pathogens are organism that causes diseases to man.

            Some pathogen can not grow outside a host and if the host died the pathogen died too.

Most pathogen tries as most as possible to live in harmony with their host and therefore take what is necessary for it existance and causes minimum harm. Pathogen that killes their host can easily be extinct.