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Natural agents of natural diseases.
Pathogen is an agent of disease. A disease producer. The term pathogen most commonly is used to refer to infectious organisms. These include bacteria such as staph, viruses such as HIV, and fungi such as yeast. Less commonly, pathogen refers to a non-infectious agent of disease such as a chemical. Pathogens such as bacteria, germs, virus, parasites, fungus, protozoans and other chemical agents such as drugs, toxins and poisons are the natural agents of natural diseases. Bacteria (singular) bacterium are a large group of unicellular microorganisms. Typically a few micrometres in length, bacteria have a wide range of shapes, ranging from spheres to rods and spirals. The name comes from the Greek word, baktērion, meaning small staff. Bacteria are ...