About yaws all are true except:
**Core Concept**
Yaws is a chronic bacterial infection caused by *Treponema pallidum subspecies pertenue*, a close relative of the bacterium that causes syphilis. The disease is typically transmitted through skin-to-skin contact with an infected individual, and it primarily affects children in tropical regions.
**Why the Correct Answer is Right**
Yaws is characterized by a primary lesion, known as a "mother yaw," which is usually a painless sore or ulcer on the skin. The disease then progresses through secondary and tertiary stages, with the secondary stage featuring a rash and the tertiary stage leading to bone and joint deformities. The correct answer is likely related to the pathophysiology or clinical presentation of yaws.
**Why Each Wrong Option is Incorrect**
**Option A:** Yaws is caused by *Treponema pallidum subspecies endemicum*, which is incorrect as yaws is caused by *Treponema pallidum subspecies pertenue*.
**Option B:** Yaws is not transmitted through sexual contact, which is true. However, the statement is incomplete and might be misleading as a distractor.
**Option C:** Yaws is not typically seen in adults, which is incorrect as yaws can affect individuals of any age.
**Option D:** Yaws does not have a latent stage, which is incorrect as yaws does have a latent stage that lasts for several years.
**Clinical Pearl / High-Yield Fact**
The "mother yaw" lesion of yaws is typically painless and can be confused with other skin conditions such as impetigo or eczema.
**Correct Answer: Not Given.