For the field diagnosis of trachoma, the WHO recommends that follicular and intense trachoma inflammation should be assessed in –
**Core Concept**
The World Health Organization (WHO) recommends a field-based diagnostic approach for trachoma, a chronic infection of the eye caused by Chlamydia trachomatis. The WHO simplified trachoma grading system is used to assess the severity of trachoma inflammation.
**Why the Correct Answer is Right**
The WHO simplified trachoma grading system focuses on assessing follicular and intense trachoma inflammation in the tarsal conjunctiva, which is the most common site of infection. The presence of follicles and intense inflammation in this area is indicative of active trachoma infection. The system uses a grading scale (0-5) to assess the severity of inflammation, with grades 1-5 representing increasing severity.
**Why Each Wrong Option is Incorrect**
* **Option A:** is incorrect because the WHO simplified trachoma grading system does not focus on assessing scarring in the tarsal conjunctiva, which is a hallmark of trachoma, but not the primary site of active infection.
* **Option B:** is incorrect because the WHO simplified trachoma grading system does not use a grading scale based on the presence of discharge, which is a symptom of trachoma, but not a reliable indicator of active infection.
* **Option C:** is incorrect because the WHO simplified trachoma grading system does not focus on assessing corneal signs, which are indicative of advanced trachoma disease, but not the primary site of active infection.
**Clinical Pearl / High-Yield Fact**
The WHO simplified trachoma grading system is a valuable tool for field-based diagnosis of trachoma, as it is easy to use and requires minimal training. It is essential to assess follicular and intense trachoma inflammation in the tarsal conjunctiva to accurately diagnose and monitor trachoma infection.
**Correct Answer: C. The tarsal conjunctiva.**