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Table 3 Distribution of Aedes larvae and entomological indices

From: Incidence of dengue and chikungunya viruses in mosquitoes and human patients in border provinces of Vietnam

Province No. of houses explored No. of positive houses (%) No. of containers explored No. of positive containers (%) Ae. aegypti larvae Ae. albopictus larvae Species ratio Entomological indices
         BIa CIb HIc
Ha Tinh 450 41 (8.1) 936 79 (8.4) 1406 551 0.65 17.56 8.44 8.12
Quang Tri 420 24 (4.9) 778 170 (21.9) 1147 423 0.73 40.48 21.85 4.82
Thua Thien Hue 480 40 (6.8) 730 202 (27.7) 1147 1022 0.53 42.08 27.67 6.77
Dac Nong 420 47 (9.2) 807 150 (18.6) 760 411 0.65 35.71 18.59 9.21
Long An 480 18 (3.0) 5128 984 (19.2) 5128 46 0.99 205 19.19 3.02
Total 2250 170 (7.5) 8549 1585 (18.9) 9588 2453 0.78 7.044 18.54 1.99
  1. aBI: Breteau Index = No. of positive containers / No. of houses explored × 100
  2. bCI: Container Index = No. of positive containers / No. of containers explored × 100
  3. cHI: House Index = No. of positive houses / No. of houses explored × 100