Which of the following is an intracellular parasite of humans that usually causes a mild pneumonia?

Question

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Chlamydophila pneumoniae is an intracellular bacterium that causes a mild pneumonia in humans. The other options listed are all intracellular parasites, but they do not typically cause a mild pneumonia in humans. Anaplasma phagocytophilium and Ehrlichia chaffeensis can cause tick-borne illnesses, Rickettsia typhi can cause typhus, and Chlamydophila psittaci causes psittacosis, a disease typically contracted from infected birds.

Which of the Following Is an Intracellular Parasite of Humans