Numerous cases of trachoma is repoed in a period of time in a village. All of the following are the criteria to establish the presence of endemic trachoma in a community, EXCEPT:
**Core Concept**
Trachoma is a leading cause of preventable blindness worldwide, caused by the bacterium Chlamydia trachomatis. Establishing the presence of endemic trachoma in a community involves identifying specific criteria that indicate widespread infection and potential long-term consequences.
**Why the Correct Answer is Right**
To diagnose endemic trachoma, the World Health Organization (WHO) recommends using the SAFE strategy: Surgery for trichiasis, Antibiotics for infection, Facial cleanliness, and Environmental improvement. One of the key criteria for establishing the presence of endemic trachoma is the presence of five or more cases of trachoma in a population of 1,000 people aged 15 years and over, or 10 or more cases in a population of 5,000 people in the same age group. This indicates a high prevalence of the disease.
**Why Each Wrong Option is Incorrect**
**Option A:** The presence of trachoma in 10% of children aged 1-9 years is actually a criterion for establishing the presence of trachoma in a community, not an exception. This is because it indicates widespread infection in the younger population, which is a key indicator of endemic trachoma.
**Option B:** The presence of 10 or more cases of trachoma in a population of 5,000 people aged 15 years and over is actually a criterion for establishing the presence of trachoma in a community, not an exception. This is because it indicates a high prevalence of the disease in the adult population.
**Option C:** The presence of blinding trachoma (trichiasis) in 0.2% or more of the population aged 15 years and over is actually a criterion for establishing the presence of trachoma in a community, not an exception. This is because it indicates the long-term consequences of untreated trachoma.
**Clinical Pearl / High-Yield Fact**
When evaluating a community for trachoma, it's essential to consider the epidemiological criteria, as well as the presence of risk factors such as poor sanitation, lack of access to clean water, and limited healthcare resources.
**Correct Answer: D.**