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Standard Membrane Feeding Assay for the Detection of Plasmodium falciparum Infection in Anopheles Mosquito Vectors

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Forest malaria in central Vietnam.

Nguyen Hong Sanh¹, Nguyen Van Dung, Nguyen Xuan Thanh

¹Institute of Malariology, Parasitology, and Entomology, Qui Nhon, Vietnam.

The American Journal of Tropical Medicine and Hygiene

|November 5, 2008

Summary

Malaria transmission in central Vietnam occurs in forest garden plots, not the village, due to the absence of a suitable vector. Conditions outside the village favor malaria transmission by the Anopheles dirus vector.

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Area of Science:

Medical Entomology
Tropical Medicine
Epidemiology

Background:

Malaria transmission dynamics in Southeast Asia.
Understanding forest malaria cycles.
Role of Anopheles vectors in disease spread.

Purpose of the Study:

Investigate the external forest malaria transmission cycle in central Vietnam.
Identify factors contributing to malaria transmission outside a village setting.
Determine the primary locations and vectors responsible for malaria spread.

Main Methods:

Field studies conducted in a village and surrounding forest areas in central Vietnam.
Assessment of vector presence and suitability for malaria transmission.
Evaluation of population distribution and malaria immunity levels.

Main Results:

Absence of suitable malaria vectors within the village indicated no local transmission.
Evidence of malaria transmission identified in villagers frequenting forest garden plots.
Presence of Anopheles dirus, a highly efficient vector, near garden plots.
Sufficient population density and existing immunity levels supported sustained transmission outside the village.

Conclusions:

Malaria transmission in this region is primarily linked to activities in forest garden plots, not within the village itself.
Anopheles dirus plays a critical role in sustaining the external forest malaria cycle.
Environmental and population factors outside the village create a conducive environment for malaria transmission.