A. A disease causing organism
A pathogen is usually defined as a microorganism that causes, or can cause, disease. We have defined a pathogen as a microbe that can cause damage in a host. Different types of pathogens are Bacteria, viruses, and fungi are all types of pathogens. A pathogen brings disease to its host. Another name for a pathogen is an infectious agent, as they cause infections.
Pathogen can be spread by several ways, including contaminated soil, water, food, and blood, as well as through sexual contact and via insect bites. The scientific study of including pathogenic microscopic organisms, is called microbiology, while parasitology refers to the scientific study of parasites and the organisms that host them.
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