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.