AI Article Synopsis
- The study focused on identifying malaria-carrying mosquitoes in Motuo County, Tibet, by collecting various mosquito species in different natural villages during July and August 2007.
- A total of 5345 anopheline mosquitoes were captured, with the majority being An. pseudowillmori, indicating this species is prevalent in the area and exhibits a preference for cattle blood over human blood.
- The findings highlight An. pseudowillmori's significant role in malaria transmission and point to rice fields as key breeding sites for mosquito larvae.
Article Abstract
Objective: To investigate the malaria transmission vectors in Motuo County of Linzhi Prefecture, Tibet.
Methods: Three natural villages with higher malaria incidence rate in Motuo County were selected for the study in July and August, 2007. The anopheline mosquitoes were collected by overnight/semi-overnight trapping indoor and outdoor with human and cattle baits, overnight trapping with ovitrap lights in human dwellings and cowsheds, and by searching in human dwellings in the early morning. The mosquitoes collected were identified morphologically, and the group proportion, density, man-biting rate, blood preference, habits and multiparous ratios were observed. Mosquito larvae breeding place was surveyed, and species of the larvae were identified.
Results: A total of 5345 anopheline mosquitoes were captured with 94.71% (5 062/5 345) of An. pseudowillmori, 2.39% (128/5 345) of An. willmori and 2.90% (155/5 345) of An. peditaeniatus. The average density of An. pseudowillmori observed through semi-overnight trapping was 17/per person indoor and 105/per person outdoor. The average man-biting rate of An. pseudowillmori through overnight trapping was 15.80/per person (79/5) indoor and 326.22/per person (1468/4.5) outdoor. The ratio of blood preference to human and cattle through overnight trapping outdoor were 30.51% (714/2340) and 69.49% (1626/2340), and 32.02% (57/178) and 67.98% (121/178) through overnight trapping with ovitrap lights respectively. It suggested that An. pseudowillmori feeding both of the human and cattle blood but preferred to cattle blood. Totally 7 An. pseudowillmori mosquitoes were found in the human dwellings in the early morning, and none of them has digested the engorged blood. The Anopheles larvae were only found in the rice field where 106 larvae were collected, including 62 An. pseudowillmori larvae, An. willmori larvae, and 44 An. peditaeniatus larvae.
Conclusion: An. pseudowillmori seems qualified as the vector biological perspectives for the local malaria transmission.
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