Dictionary of Human Evolution and Biology

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Any microorganism in the order Eubacteriales. Plural: bacteria. Bacteria have a well-defined cell wall, can reproduce without the requirement of a host cell, and can be classified according to shape: spherical (coccus), rod-shaped (bacillus), and spiral (spirillum and spirochete). In humans, diseases caused by bacteria are the most common mode of fatal infectious disease in developed countries, and a leading cause in underdeveloped countries; bacterial.

See syphilis, and bacterial diseases.

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From "Dictionary of Nursing and Individual Health Care"