STUDY ON THE TRANSMISSION THRESHOLD OF MALARIA BY ANOPHELES ANTHROPOPHAGUS IN HILLY LAND OF HUBEI PROVINCE

Objective To study the role of Anopheles anthropophagus in malaria transmission and transmission threshold, so as to provide basis for vector surveillance and malaria control strategy. Methods Parasitology and entomology methods were used in the investigation at 9 villages of Zengdou region of Suizhou City? Results From July to August, 2001, the febrile cases examination rate was 1.89%, the malaria incidence was 0.65%, the parasite rate and the positive rate of IFA of pupil was 0.51% and 5.05% respectively. An. anthropophagus, An. sinensis and An. minimus were collected, with An. anthropophagus as the predominant one in human blood index were 0.989 2 and 0.5000 respectively. The vectorial capacity and the threshold man-biting rate of An. anthropophagus were 0.944 8 and 0.282 3 respectively . The local man-biting rate was 3.5 times higher than that of the threshold man-biting rate. Conclusion The results demonstrated that An. anthropophagus is the principal vector in malaria transmission in the area. The findings imply that the threshold man-biting rate is of practicable importance in vector surveillance. [