MSPTM 2019 Annual Scientific Conference
13 - 14 March 2019
InterContinental Kuala Lumpur



Effectiveness of Residual Sprayed Deltamethrin Formulations in Dengue Control

Oral Presentation
Scaling Up Efforts in Tropical Disease and Vector Control through Evidence-Based Research
Vector Biology & Control


Main Author
Rohaiyu Md Rodzay1
Presenting Author
Rohaiyu Md Rodzay1
Nurulhusna Ab Hamid1
Siti Fadhlina Mohd Noor1
Ainaa Mardia Bactiar Effendi1
Nur Rasyidah Isa1
Afiq Ahnaf Hafisool1
Fatin Atirah Azman1
Balqis Md Ruslan1
Muhammad Khairi Kamaruzaman1
Siti Farah Abdullah1
Nazni Wasi Ahmad1

Authors' Institution

Department / Institution / Country
Medical Entomology Unit / Institute For Medical Research / Malaysia1
Abstract Content

Outdoor residual spraying is a new approach used as an outdoor treatment for dengue control The insecticide is applied onto the outer wall surface,which is the resting and hiding place for Aedes mosquitoes. However, the outer wall surface that is exposed to rainfall and sunlight can cause a reduction in insecticide effectiveness over time. This study was conducted to determine the residual efficacy of two different deltamethrin formulations: Polymer-Enhanced Suspension Concentrate (SC-PE) and Wettable Granule (WG) on concrete walls using standard WHO wall deposit bioassay. The insecticides were prepared in two concentrations: 25 mg/m2and 30 mg/m2. Susceptible laboratory strain (LS) and wild strain (WS) of Aedes aegypti and Aedes albopictus were utilized in this study. The tests were conducted weekly for five months on four designated concrete walls of a building in the IMR compound in Kuala Lumpur. Mosquitoes were exposed to the treated walls for 30 minutes and mortality was recorded after 24 hours. SC-PE 30 mg/mcaused the highest mean mortality in LS Ae. aegypti (80.30%, p<0.05), LS Ae. albopictus (55.20%,  p=0.055) and WS Ae. albopictus (49.3%, p=0.550) in comparison to WG formulation and concentrations. Meanwhile,the highest mean mortality of WS Ae. aegypti (22.5%, p=0.359) were recorded after exposed to WG at 30 mg/mbut the percentage is only slightly higher and not significant compared to SC-PE 30 mg/m(22.2%, p=0.359). The results suggested SC-PE 30 mg/mis a better formulation since it was still effective in eliminating 50% of mosquito population for 21 weekscompared to WG formulation, which lasted only 15 weeks.In conclusion, our results indicate that the performance of the SC-PE exceeded that of traditionally formulated WG on treated cement surfaces. Therefore, the usage of ORS with SC-PE formulation should be considered as an effective and innovative approach for thedengue vector control programmes.  

Keywords: Aedes; Outdoor Residual Spraying; SC-PE Deltamethrin; WG Deltamethrin;
Requires Audio or Video system for Presentation?: No