High and Low Risk Dengue Haemorrhagic Fever Areas Affecting Key Breeding Place of Aedes aegypti (L.) and Ae. albopictus (Skuse) in Nakhon Si Thammarat, Southern Thailand

This study investigated key breeding sites of Aedes aegypti (L.) and Ae. albopictus (Skuse) in high and low risk dengue haemorrhagic fever (DHF) areas. Ae. aegypti and Ae. albopictus larvae were found in 11 out of 29 types of water containers in both high and low risk DHF areas. Ae. aegypti larvae were found most in outdoor area containers in high risk DHF areas and in metal boxes in low risk DHF areas. On the other hand, Ae. albopictus larvae were found most in indoor earthen jars in low risk DHF areas and in areca containers in high risk DHF areas. The number of Ae. albopictus larvae found in the earthen jars and metal or plastic boxes in low risk areas were higher than in high risk DHF areas. Larval indices (i.e. HI and BI) in both high and low risk DHF areas were greater than 10 % and 50 %, respectively, which indicated high risks of DHF transmission.