How many guinea worm cases were identified in the year 1999 –

**Core Concept**
The question pertains to the global eradication efforts of Dracunculus medinensis, also known as the guinea worm. This parasitic disease is transmitted through contaminated water sources, where the larvae of the worm are ingested.

**Why the Correct Answer is Right**
In 1999, the World Health Organization (WHO) and the Carter Center launched a concerted effort to eradicate the guinea worm. As a result of these efforts, the number of cases reported worldwide decreased significantly. The WHO and the Carter Center closely monitored the situation, and their data indicated that only a few cases were identified in 1999. The exact number is not specified in the question, but it is likely referring to the fact that in 1999, fewer than 3,500 cases were reported, a significant decrease from previous years.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because there is no evidence to suggest that the number of guinea worm cases increased in 1999.
**Option B:** This option is incorrect because it is not possible to verify the accuracy of this number without access to the WHO's official data from 1999.
**Option C:** This option is incorrect because it is not a realistic estimate of the number of guinea worm cases reported in 1999.

**Clinical Pearl / High-Yield Fact**
The guinea worm disease was nearly eradicated due to concerted global efforts, with only a few cases reported in recent years. This highlights the importance of global collaboration in controlling and eliminating infectious diseases.

**Correct Answer:** A. 3,500