An infection is the in short the hosting of foreign species in a host organism. There is a war that is involved between the host and the foreign body as the infection organism is looking to use the hosts resources in order to multiply.
Pathogens are a broad group that include: (Infectious Disease is the specific branch of medicine that focuses on these infections and pathogens.)
All organisms with multiple cells(multicellular) are colonized to some extent by an extrinsic organisms. The large majority of these exist in either a relationship with the host like mentioned above. The difference between an infection and a colonization is due to the circumstance which exists as a result of the former. Basically if the colonization of the external body comprises the life of the host organisms it is an infection.
Several variables are involved which determine the intruders outcome on the host:
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