Any microorganism that is capable of causing disease is considered to be a a. rickettsiae. b. pathogen. c. bacteria. d. protozoan .

B. pathogen.

Explanation: Any microorganism capable of causing disease is considered to be a pathogen, or infectious agent. In order for disease to occur, the pathogen must be present. There are five classifications of pathogenic microorganisms: viruses, bacteria, fungi, parasites, and rickettsiae... PF

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