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Area Gravidtrap Index and Area Density Index by survey area.

Published Food and Environmental Hygiene Department indices only. Not medical advice, not a dengue diagnosis, and this page does not give going-out advice.

Reading the FEHD survey feed…

District and region names are the dataset fields, printed as published.

FEHD index value remarks

  1. Green: Level I

    Gravidtrap Index < 5.0% [indicates that the distribution of Aedes albopictus is not extensive]

    1.0 ≤ Density Index ≤ 1.5 [Aedes albopictus is not abundant in the locations with positive Gravidtraps]

  2. Yellow: Level II

    5.0% ≤ Gravidtrap Index < 20.0% [indicates that the distribution of Aedes albopictus is fairly extensive]

    1.6 ≤ Density Index ≤ 2.4 [Aedes albopictus is slightly abundant in the locations with positive Gravidtraps]

  3. Red: Level III

    20.0% ≤ Gravidtrap Index < 40.0% [indicates that the distribution of Aedes albopictus is extensive]

    Density Index ≥ 2.5 [Aedes albopictus is abundant in the locations with positive Gravidtraps]

  4. Purple: Level IV

    Gravidtrap Index ≥ 40.0% [indicates that the distribution of Aedes albopictus is very extensive]

Where this file records ADI as 0, the figure is shown as N/A, the mark FEHD uses when no Aedes-positive Gravidtrap was found. The minimum Density Index is 1.0.