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Pathogenic bacteria
Pathogenic bacteria are bacteria that can cause infection. This article deals with human pathogenic bacteria.
Although most bacteria are harmless or often beneficial, several are pathogenic. One of the bacterial diseases with the highest disease burden is tuberculosis, caused by the bacterium ''Mycobacterium tuberculosis'', which kills about 2 million people a year, mostly in sub-Saharan Africa. Pathogenic bacteria contribute to other globally important diseases, such as pneumonia, which can be caused by bacteria such as ''Streptococcus'' and ''Pseudomonas'', and foodborne illnesses, which can be caused by bacteria such as ''Shigella'', ''Campylobacter'', and ''Salmonella''. Pathogenic bacteria also cause infections such as tetanus, typhoid fever, diphtheria, syphilis, and leprosy. Pathogenic bacteria are also the cause of high infant mortality rates in developing countries.
Koch's postulates are the standard to establish a causative relationship between a microbe and a disease.
==Diseases==
Each species has specific effect and causes symptoms in people who are infected. Some, if not most people who are infected with a pathogenic bacteria do not have symptoms. Immuno-compromised individuals are more susceptible to pathogenic bacteria.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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