The Tropics is the most ecologically diverse region on Earth, presenting intricate challenges of tropical diseases and other health problems. With the remarkable advances in international exchanges in recent years, including increased mobility and demographic shifts, it is imperative that these problems be addressed from a global perspective.

The Department of Vector Ecology & Environment, Institute of Tropical Medicine, Nagasaki University was established in 1987, as a unique government-supported laboratory aiming to overcome tropical diseases, particularly vector borne diseases, and the various health problems associated with them. Since then the department has been pursuing basic and applied research on vector ecology and control in collaboration with many institutions in and out country.

The main interest of the department is analysis of environmental factors that affect transmission of insect-borne diseases, and pursuit of environment friendly vector control strategies. The main venues of research are at sites in Southeast and East Asia inhabited by the subject vectors. The following are current projects of the department.

(1) Environmental changes and malaria vectors

# Long-term monitoring of vector situation and habitat conditions at several fixed fields in Southeast Asian countries since 1988.

# Thirty years environmental changes affecting the occurrence of malaria vectors in northern Thailand.

# Database analysis of shelf   stocked records on malaria epidemiology.
# Laboratory rearing experiments on development and survival of vector mosquitoes.
# Simulation model study in relation to environmental and vector parameters.

(2) Habitat selection of vector mosquitoes

# Photo-analysis of various vector habitats using basic component analysis.
# Adopting the geographical information system (GIS) including remote sensing image (RS) as a new tool. Larva and adult collection from various habitats.

(3) Geographical variation of malaria vectors with special attention to Anopheles  minimus group

# Identifying to varieties of sibling species.

# Ecological and physiological differences among local populations.

(4) Ecology of dengue vectors

# Infestation of dengue vectors in relation to urbanization, with special focus on proposing new larval indices.

# Regular monitoring of Aedes aegypti, and Ae. albopictus using ovi-traps at sites with different levels of urbanization.
Mark, release and recapture trials.

# Behavioral responses in the host seeking behavior of Ae. aegypti and Ae. albopictus.

(5) The ecology of rice field breeding mosquitoes with special attention to rice culturing  practices

# Evaluation of mosquito abundance in various types of rice fields in Japan, Thailand and Vietnam.

# Analytical study of the adult behavior of natural populations.

(6) Malaria epidemiology in Southeast Asian countries


# Vector situation survey.

(7) New approach to vector control using chemicals


# Laboratory experiments. Evaluation of the efficacy of insect growth regulators and space repellents.

Research and Investigation