Germ theory of disease

Scanning electron microscope image of Vibrio cholerae. This is the bacterium that causes cholera.

A representation of the cholera epidemic of the 19th century depicts the spread of the disease in the form of poisonous air.

Original map by John Snow showing the clusters of cholera cases in the London epidemic of 1854

Louis Pasteur in his laboratory, painting by A. Edelfeldt in 1885

The germ theory of disease states that some 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 microorganisms, especially one which causes disease, such as protist, fungus, virus, prion, or viroid. 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 particular host individual becomes infected when exposed to the pathogen.

单词	Germ theory of disease
释义	Germ theory of disease 原声例句起源的故事 And what did we believe before and after the germ theory of disease was considered the norm? 在疾病的微生物理论被视为规范之前和之后我们都是怎么以为的？起源的故事 Battling disease prior to the germ theory of disease's emergence in the 19th century was also equally misguided. 在19世纪疾病的细菌理论出现之前与疾病作斗争同样是错误的。英语百科 Germ theory of disease The germ theory of disease states that some 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 microorganisms, especially one which causes disease, such as protist, fungus, virus, prion, or viroid. 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 particular host individual becomes infected when exposed to the pathogen.
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