However, some pathogenic bacteria may be present in normal individuals without causing a disease. The distinction between the two can be made based on the Koch’s Postulates. Pathogenic and nonpathogenic bacteria are the two main types of bacteria other organisms are in contact with. Another difference between pathogenic and nonpathogenic bacteria is that the pathogenic bacteria invades the cells of the body while nonpathogenic bacteria live outside the body cells. Moreover, pathogenic bacteria possess several genes that endow the capacity to cause diseases while nonpathogenic bacteria lack such genes. The main difference between pathogenic and nonpathogenic bacteria is that the pathogenic bacteria can cause diseases while the nonpathogenic bacteria are harmless.
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