In a postprimary or reactivation stage infection of tuberculosis, the most common nonrespiratory infection sites are the:
1. lymph nodes and genitourinary system.
2. skin and muscles.
3. bowel and liver.
4. heart and blood vessels.
Correct Answer: 1
Rationale 1: These organs are the sites of infection in the postprimary stage.
Rationale 2: The skin and muscles are not the organs affected in the postprimary stage.
Rationale 3: The bowel and liver are not the most common areas affected in the postprimary stage.
Rationale 4: The heart and blood vessels are not affected in the postprimary stage.
Global Rationale: If the immune system becomes suppressed later in life, the dormant mycobacteria may enter a postprimary or reactivation stage. Once reactivated, M. tuberculosis can be disseminated throughout the body via the blood or lymphatic system. Lymph nodes and organs of the genitourinary system are the most common nonrespiratory sites, although infections of the bone marrow and liver are possible. Skin, muscles, heart, and blood vessels are not commonly affected.
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