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.

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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.

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