The entomological index used to assess Aedes aegypti infestation in urban areas for dengue risk is the House Index (HI), Breteau Index (BI), and Container Index (CI). The Breteau Index is defined as:

• A Number of positive containers per 100 houses inspected ✓
• B Number of positive houses per 100 houses inspected
• C Number of positive containers per 100 containers inspected
• D Number of adult Aedes females captured per trap per night

Explanation

Breteau Index = (Number of positive containers / Number of houses inspected) × 100 — it accounts for multiple positive containers per house, making it more informative than the House Index. House Index = (Positive houses / Total houses inspected) × 100. Container Index = (Positive containers / Total containers inspected) × 100. Breteau Index >5 indicates significant dengue transmission risk.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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Written and medically reviewed by the StethoPrep medical team.