Question:medium
About yaws, all are true except:
About yaws, all are true except:
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Yaws spares the heart and nervous system, unlike syphilis.
Updated On: Jun 24, 2026
- Caused by Treponema pertenue
- Transmitted non-venereally
- Secondary yaws can involve bones and joints
- Late stages involve the heart and nerves
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The Correct Option is D
Solution and Explanation
Yaws belongs to the family of endemic treponematoses and is distinguished from syphilis by both its mode of spread and its complications. The organism responsible is Treponema pallidum subsp. pertenue, classically written as T. pertenue, confirming option A. Spread occurs through casual non-sexual skin contact, typically among children in warm humid climates, confirming the non-venereal nature in option B. In its secondary phase the disease disseminates and may damage bone and joint tissue with periostitis and dactylitis, confirming option C. The key contrast with syphilis is that yaws spares the cardiovascular system and the central nervous system; it does not progress to aortitis or neurological disease. Therefore the claim that late-stage yaws involves heart and nerves is the incorrect statement and is the answer being sought.
\[\boxed{\text{Late stages involve heart and nerves}}\]
\[\boxed{\text{Late stages involve heart and nerves}}\]
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