pathogen, pathology

pathogen: the causative agent of a communicable disease. For example, influenza (disease) is caused by influenza virus (pathogen); malaria (disease) is caused by species of Plasmodium (pathogen). It is a common mistake to use the term for the disease when you actually mean the pathogen, and vice versa

He contracted measles     not     He contracted measles virus
The sample was tested for measles virus     not     The sample was tested for measles

pathology: the study of diseases; do not use to mean disease

Influenza is a disease     not     Influenza is a pathology

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