what is germ theory?
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Germ theory of disease
The germ theory of disease is the currently accepted scientific theory of disease. It states that many diseases are caused by microorganisms. These small organisms, too small to see without magnification, invade humans, animals, and other living hosts.
The germ theory of disease is the currently accepted scientific theory of disease. It states that many diseases are caused by microorganisms. These small organisms, too small to see without magnification, invade humans, animals, and other living hosts. Their growth and reproduction within their hosts can cause a disease. "Germ" may refer to not just a bacterium but to any type of microorganism, especially one which causes disease, such as protists, fungi, viruses, prions, or viroids. Microorganisms that cause disease are called pathogens, and the diseases they cause are called infectious diseases. Even when a pathogen is the principal cause of a disease, environmental and hereditary factors often influence the severity of the disease, and whether a potential host individual becomes infected when exposed to the pathogen.