A rural population is 3000. 500 having fever and symptoms like malaria which is only 30 cases is positive of malaria. What is the API of this rural population?

1. A

   0.05

2. B

   0.01

3. C

   0.1

4. D

   6

Appeared in: NORCET -4 , 2023

Explanation

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• The question asks for the Annual Parasite Incidence (API), but the options reflect the simple incidence proportion.
• The incidence proportion is calculated by dividing the number of new cases by the total population.
• Calculation: 30 confirmed malaria cases ÷ 3000 total population = 0.01.
• This value represents the risk of developing malaria in this population over a year.

Why Other Options Were Wrong

• Option A: This value (0.05) does not correspond to any standard epidemiological calculation using the given numbers. It might result from a miscalculation, such as dividing 500 by 3000 and then dividing by 3 (500/3000 ≈ 0.167; 0.167/3 ≈ 0.055).
• Option C: This value (0.1) would be the result if the population were 300 (30 ÷ 300 = 0.1) or if there were 300 cases in a population of 3000 (300 ÷ 3000 = 0.1). It is an incorrect calculation with the given data.
• Option D: The value 6 represents the Slide Positivity Rate (SPR) in percentage, not the API. SPR is the percentage of blood slides that test positive for malaria out of all the slides examined from suspected cases.

Related Visual

• Visual 1: Infographic: A visual chart comparing the formulas for Annual Parasite Incidence (API), Slide Positivity Rate (SPR), and Annual Blood Examination Rate (ABER) to clarify their distinct purposes in malaria surveillance.
• Visual 2: Flowchart: A diagram showing the flow of data in a malaria surveillance program, from a person with fever to a confirmed case, and how each number contributes to calculating different public health indicators.

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Calculation of Annual Parasite Incidence (API) in a population as background academic context rather than a clinical decision trigger.
• Understanding malaria indicators is crucial for nurses in community health to assess the magnitude of the problem, monitor trends, and evaluate the effectiveness of control programs.
• API helps in stratifying areas by risk level (e.g., high, low, or pre-elimination), guiding resource allocation for interventions like vector control and drug distribution.
• SPR is a key indicator of the current transmission intensity and the efficiency of case detection. A rising SPR can be an early warning sign of an impending outbreak.

How to Approach the Question

• First, identify the specific indicator being asked for in the question, which is 'API' (Annual Parasite Incidence).
• Recall the standard formula for API: (Confirmed Cases / Total Population) × 1000.
• Extract the necessary values from the problem: Confirmed Cases = 30, Total Population = 3000.
• Calculate the standard API: (30 / 3000) × 1000 = 10.
• Compare the result with the given options. If the exact result is not an option, re-evaluate the question's intent. Notice that the simple proportion (without the ×1000 multiplier) is an option.
• Calculate the incidence proportion: 30 / 3000 = 0.01. Select this as the most plausible answer among the choices.

Concept Tested & Keywords

• Concept Tested: Calculation of Annual Parasite Incidence (API) in a population.
• Stem keywords: rural population, fever, malaria, positive, API
• Lead-in keywords: What is
• Clinical cues: Total population: 3000
• Clinical cues: Suspected cases: 500

Question ID

Q3yGMYgsqsqprrLegpkNZK

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