The Stegomyia (Breteau) Index is used to assess Aedes aegypti infestation. It is defined as:

• A Number of houses with Aedes larvae per 100 houses inspected
• B Number of positive containers per 100 houses inspected ✓
• C Number of Aedes adults collected per 100 trap-nights
• D Ratio of Aedes pupae to adults in a defined area

Explanation

The Breteau Index (BI) = (number of positive containers/number of houses inspected) × 100. It measures the number of water-holding containers positive for Aedes larvae or pupae per 100 houses, making it the most informative of the three Stegomyia indices. The House Index = number of houses with positive containers/total houses × 100. The Container Index = positive containers/total containers × 100. BI > 20 indicates epidemic risk for dengue.

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

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Written and medically reviewed by the StethoPrep medical team.