What is a pathogen?

A pathogen is a disease causing micro-organism. Pathogens include viruses (coronavirus), bacteria (cholera), fungi (aspergillosis) and protozoa (malaria).

A pathogen is a microrganism that can cause disease. For example a pathogen a be either a bacterium, virus, or a fungi.

A pathogen is a micro-organism which can cause disease, this could be a bacterium, virus, Protozoa or fungi. Their method of transmission can vary as can their rate of reproduction, depending on the type of micro-organism.

A pathogen is a microorganism—such as a bacterium, virus, fungus, or parasite—that causes disease in a host. They invade the host, evade immune defenses, and can disrupt normal functions, leading to illness. Pathogens can be transmitted through direct contact, airborne particles, contaminated food or water, and vectors like insects.