Microbiology Question:
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Each of the following is true regarding Pneumocystis carinii. Which statement is false?

Answer:

* A. It lives as a commensal in most humans
* B. It is a common cause of community acquired pneumonia
* C. It is an AIDS defining illness in patients with HIV
* D. It caused pneumonia in malnourished children after World War II
* E. The most sensitive way of making the diagnosis is with a direct immunoflourescence stain on sputum or Bronchoalveolar lavage

Correct Answer: B

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Each of the following parasites pass through the human lung at some time during their life cycle but only one establishes a home where it divides and causes a chronic disease state. Which one lives in the lung as a definitive host?A 44-year-old native Nigerian who has lived in the USA for 10 years returned to visit his family in Africa and now presents with a history of shaking chills, followed by high fever and then profuse sweating. He states that this is the most severe case of malaria he has ever had. His blood smear shows malaria organisms consistent with Plasmodium falciparum. Which of the following statements is false regarding P. falciparum?