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      Question

      Which of these organisms is considered a facultative

      pathogen?
      A Mycobacterium tuberculosis Correct Answer Incorrect Answer
      B Plasmodium falciparum Correct Answer Incorrect Answer
      C Escherichia coli Correct Answer Incorrect Answer
      D Treponema pallidum Correct Answer Incorrect Answer

      Solution

      Facultative pathogens, like Escherichia coli, can survive in both environmental and host-associated conditions. These organisms are capable of causing infections but also exist harmlessly in environments such as the human gut.

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