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Table 1 Recommended Breteau Index for Aedes aegypti (BIagp) and Aedes albopictus (BIalb) values based on frequency analysis

From: Empirical optimization of risk thresholds for dengue: an approach towards entomological management of Aedes mosquitoes based on larval indices in the Kandy District of Sri Lanka

Probability of occurrence (%)

BIagp (%)

BIalb (%)

Risk category

Recommended actions

Akurana

Gampola

KMC and GK

Average

Akurana

Gampola

KMC and GK

Average

20

6.50

6.40

5.80

6.23

8.80

9.20

6.40

8.13

High risk

Extensive fogging

40

4.30

5.30

3.80

4.47

6.30

8.20

5.30

6.60

Moderate risk

Target oriented fogging

60

2.90

4.50

2.30

3.23

4.45

7.20

4.50

5.38

Risk

Intensive vector surveillance and government involved source reduction programmes

85

1.20

3.6

0.50

1.77

2.15

6.20

3.50

3.95

Low risk

Be alert and motivate source reduction of vector breeding sites