During pre-monsoon Aedes survey in a town, 200 houses are visited. 30 houses are found positive for Aedes larvae and a total of 70 containers are positive. Which statement correctly interprets these findings?
- A House Index of 35% indicates no risk of transmission
- B Breteau Index of 35 is below the epidemic threshold
- C Breteau Index above 5 indicates the area is at high risk of an outbreak ✓
- D Container Index cannot be calculated from these data
Correct answer: C. Breteau Index above 5 indicates the area is at high risk of an outbreak
Explanation
House Index is percentage of houses positive (30 of 200 = 15%) and Breteau Index is number of positive containers per 100 houses (70 of 200 x 100 = 35). As per standard texts, a Breteau Index above 5 signals high risk of dengue transmission, and any House Index above 1% warrants control measures. Container Index can be calculated if total containers examined are known, so option D is incorrect.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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