a pathogen is an organism that
We normally think of pathogens in hostile termsas invaders that attack our bodies. Living at the expense of a host organism is a very attractive strategy and it is possible that every living organism on earth is subject to some type of infection or parasitism Figure 25-1. Tuberculosis Bacteria By Ilexx Mycobacterium Tuberculosis Is A Pathogenic Bacterial Species In The Family Mycobacteri Tuberculosis Disease Reproductive Health But a pathogen or a parasite like any other organism is simply trying to live and procreate. . Any small organism such as a virus or a bacterium that can cause disease.