Medical quality assurance by Dr. Albrecht Nonnenmacher, MD at November 18, 2015

In this category, you will find an alphabetical list of important pathogens.

A pathogen is anything that causes a disease in a person, animal or plant. Scientists have identified numerous pathogens. They divide these infectious agents into five categories, which include bacteria, viruses, fungi, protozoa and helminths.

The first three are considered microorganisms; these pathogens are studied in the field of microbiology. Protozoa and helminths, or worms, are parasites, so they fall under the umbrella of parasitology.

The characteristic features of a pathogen are the way it is transmitted, how it replicates, the method it uses to cause disease and the response it triggers. Once they enter a host, pathogens can grow in various areas of the body, causing damage in an assortment of ways.

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