UPSC-CMS 2024 - Community Medicine Practice Questions

Q: The National AIDS Control Organization provides prepacked colour-coded STI/RTI kits as a free supply to its designated STI/RTI clinics. Consider the following pairs: Pair No Colour codes STI/RTI conditions 1 Red Urethral discharge 2 Green Vaginitis 3 White Inguinal bubo How many of the pairs given above are correctly matched?

Only two of the pairs. ***Only two of the pairs*** - Pair 1 (Red - Urethral discharge) is **correctly matched** according to NACO STI/RTI syndromic management guidelines - Pair 3 (White - Inguinal bubo) is **correctly matched** as per NACO color-coding system - Pair 2 (Green - Vaginitis) is **incorrectly matched** because Green kit is designated for lower abdominal pain, not vaginitis - **Yellow kit** is used for vaginal discharge/vaginitis, not Green - NACO color-coded kits ensure standardized syndromic management: Red (urethral discharge), Yellow (vaginal discharge), Green (lower abdominal pain), White (genital ulcer/inguinal bubo) *Only one pair* - This is incorrect as two pairs are correctly matched (Red-Urethral discharge and White-Inguinal bubo) - Green is not the correct color for vaginitis; it is meant for lower abdominal pain syndrome *All the pairs* - This is incorrect because Pair 2 (Green-Vaginitis) is wrongly matched - Green kit is designated for lower abdominal pain, while Yellow kit is for vaginal discharge/vaginitis - Only two out of three pairs are correctly matched *None of the pairs* - This is incorrect as both Pair 1 (Red-Urethral discharge) and Pair 3 (White-Inguinal bubo) are correctly matched according to NACO guidelines - Two pairs show accurate color-syndrome correlation

Q: The table below shows the results of ELISA test for HIV infection : Consider the following statements : 1. The sensitivity is 98%. 2. The specificity is 99%. Which of the statements given above is/are correct?

2 only. ***2 only*** - From the ELISA test table, we need to calculate sensitivity and specificity using standard formulas. - **True Positives (TP)** = Infected individuals who tested positive = **4900** - **False Negatives (FN)** = Infected individuals who tested negative = 5800 - 4900 = **900** - **True Negatives (TN)** = Non-infected individuals who tested negative = 95000 - 950 = **94050** - **False Positives (FP)** = Non-infected individuals who tested positive = **950** - **Sensitivity = TP / (TP + FN)** = 4900 / 5800 = **84.48%** (NOT 98%) - **Specificity = TN / (TN + FP)** = 94050 / 95000 = **99.0%** ✓ - **Statement 1 is INCORRECT** (sensitivity is 84.48%, not 98%) - **Statement 2 is CORRECT** (specificity is indeed 99%) *1 only* - This option is incorrect because statement 1 claims sensitivity is 98%, but the calculated sensitivity is only 84.48%. - The test correctly identifies only about 84.5% of infected individuals, missing approximately 15.5% (false negatives). *Both 1 and 2* - This option is incorrect because statement 1 is false. - While statement 2 regarding specificity (99%) is correct, statement 1 regarding sensitivity (98%) is incorrect. *Neither 1 nor 2* - This option is incorrect because statement 2 is correct. - The specificity calculation clearly shows 99%, so at least one statement is correct.

Question 1

The National AIDS Control Organization provides prepacked colour-coded STI/RTI kits as a free supply to its designated STI/RTI clinics. Consider the following pairs: Pair No Colour codes STI/RTI conditions 1 Red Urethral discharge 2 Green Vaginitis 3 White Inguinal bubo How many of the pairs given above are correctly matched?

Accepted Answer

Only two of the pairs

Answer

All the pairs

Answer

Only one pair

Answer

None of the pairs

Question 2

The table below shows the results of ELISA test for HIV infection :

Consider the following statements :

1. The sensitivity is 98%.
2. The specificity is 99%.

Which of the statements given above is/are correct?

Accepted Answer

2 only

Answer

Both 1 and 2

Answer

Neither 1 nor 2

Answer

1 only

UPSC-CMS 2024 — Community Medicine