Anopheles dirus was fed with the mice of Kunming strain infected by plas-modium yoelii yoelii (By265 strain) for three or four days. Then the midgut and the salivary glands of the mosquitoes were examined. It was found that the infection rate of the malaria parasite of the midgut was 78.57% (44/56), but that of the salivary glands was only 4.88% (2/41) . After two passages of the malaria parasite through the mice and the mosquitoes, the infection rate of the salivery glands could be increased up to 13.96% (6/43).
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