To achieve a Net Reproduction Rate (NRR) of 1,the Couple Protection Rate (CPR) should be:(2018)
**Question:** To achieve a Net Reproduction Rate (NRR) of 1, the Couple Protection Rate (CPR) should be:
A. X%
B. Y%
C. Z%
D. W%
**Correct Answer:** .
**Core Concept:** Net Reproduction Rate (NRR) and Couple Protection Rate (CPR)
**Why the Correct Answer is Right:**
The correct answer to achieve an NRR of 1 is W%. This means that the number of new infections transmitted to partners by infected individuals should be equal to the number of new infections acquired by the infected individuals from their partners. When the CPR (Couple Protection Rate) is W%, it indicates that the number of infections prevented in partners is equal to the number of infections acquired by the infected individuals.
**Why Each Wrong Option is Incorrect:**
A. X% (Option A): An NRR of 1 cannot be achieved if the CPR is less than 100%, indicating that more infections are transmitted than prevented.
B. Y% (Option B): Similar to Option A, achieving an NRR of 1 requires that the number of infections prevented equals the number acquired, which is not possible with a CPR less than 100%.
C. Z% (Option C): Similar to Options A and B, an NRR of 1 requires a CPR of 100%, which is not possible with a CPR less than 100%.
D. W% (Correct Answer): When the CPR is W%, it indicates that the number of infections prevented equals the number acquired, allowing for an NRR of 1, indicating successful prevention of HIV transmission.
**Why the Correct Answer is Right:**
The correct answer (W%) is right because it addresses the key requirement for an NRR of 1. In order to achieve this, the number of infections prevented in partners must be equal to the number of infections acquired by the infected individuals. This is only possible when the CPR (Couple Protection Rate) is 100%, meaning all sexually active individuals should use highly effective prevention methods consistently and correctly. By achieving a CPR of 100%, the number of infections prevented equals the number acquired, resulting in an NRR of 1, indicating successful prevention of HIV transmission.
**Why Each Wrong Option is Incorrect:**
A. X% (Option A): A CPR less than 100% indicates that more infections are transmitted than prevented, making it impossible to achieve an NRR of 1.
B. Y% (Option B): Similar to Option A, a CPR less than 100% results in more infections transmitted than prevented, preventing an NRR of 1.
C. Z% (Option C): As with Options A and B, a CPR less than 100% leads to more infections transmitted than prevented, preventing an NRR of 1.
D. W% (Correct Answer): When the CPR is 100%, the number of infections prevented equals the number acquired, resulting in an NRR of 1, indicating successful HIV prevention.