As per WHO, leprosy is a public health problem if prevalence is –
**Core Concept**
Leprosy, also known as Hansen's disease, is a chronic bacterial infection caused by Mycobacterium leprae, primarily affecting the skin, peripheral nerves, and mucous membranes. The World Health Organization (WHO) sets criteria to determine when leprosy is considered a public health problem in a region.
**Why the Correct Answer is Right**
WHO defines leprosy as a public health problem when the prevalence of leprosy is above 1 case per 10,000 population. This threshold indicates that the disease is widespread enough to require targeted public health interventions. Leprosy prevalence is usually measured by conducting household surveys or population-based studies to identify the number of new cases per 10,000 people.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is too low and does not meet the WHO criteria for a public health problem.
**Option B:** This option is incorrect because it is too high and exceeds the WHO threshold for a public health problem.
**Option C:** This option is incorrect because the prevalence rate is not clearly specified, and it may not align with the WHO criteria.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the WHO's 1 case per 10,000 population threshold is used to determine when leprosy is a public health problem, and it serves as a guideline for implementing targeted interventions and disease control measures.
**Correct Answer:** C.