WHO recommended Sampling method for Immunisation coverage evaluation
**Core Concept**
The World Health Organization (WHO) recommends a systematic approach to sampling for immunization coverage evaluation, which involves selecting a representative sample of the population to estimate the coverage of vaccines. This is crucial for monitoring and evaluating the effectiveness of immunization programs.
**Why the Correct Answer is Right**
The WHO-recommended sampling method for immunization coverage evaluation is the Lot Quality Assurance Sampling (LQAS) method, which is a type of cluster sampling. LQAS involves dividing the population into clusters, selecting a random sample of clusters, and then conducting a survey within each selected cluster. This method is useful for estimating immunization coverage in large populations with limited resources. The LQAS method is based on the principle of comparing the immunization coverage in the selected clusters to a predetermined threshold, which is set based on the desired level of coverage.
**Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not specify a recognized sampling method for immunization coverage evaluation.
- **Option B:** This option is incorrect because it is not a systematic approach to sampling, which is essential for estimating immunization coverage.
- **Option C:** This option is incorrect because it is a method used for evaluating the quality of food products, not immunization coverage.
**Clinical Pearl / High-Yield Fact**
Remember that the Lot Quality Assurance Sampling (LQAS) method is a simple, cost-effective, and reliable approach to estimating immunization coverage, especially in low-resource settings.
**Correct Answer:** D.