are non pathogenic bacteria harmful
The terms pathogenic and non-pathogenic are often are applied to various microbes. By definition, a pathogen is a specific cause of a disease, while a non-pathogen is considered harmless.In reality, the distinction is not always clear.In 1890, the German physician Robert Koch formalized the criteria to classify bacteria as pathogenic.(See Koch's Postulates).y definition, a pathogen is a specific cause of a disease, while a non-pathogen is considered harmless. In reality, the distinction is not always clear. In 1890, the German physician Robert Koch formalized the criteria to classify bacteria as pathogenic. (See Koch's Postulates).