两种按蚊对食蟹猴疟原虫B株敏感性的比较

用食蟹猴疟原虫B株接种恒河猴后,在最佳感染时机血餐,第7d胃感染率,大劣按蚊平均为94.9％(74/78),斯氏按蚊平均为94.6％(70/74)。第12d涎腺感染率,大劣按蚊平均为93.9％(62/66),斯氏按蚊平均为92.2％(59/64),两者的胃和涎腺感染率无显著性差异。卵囊均数,大劣按蚊为124.2个,斯氏按蚊为47.6个,前者为后者的2.6倍。在欠佳感染时机血餐,大劣按蚊的胃和涎腺感染率均高于斯氏按蚊,大劣按蚊的卵囊均数为斯氏按蚊的3倍余。

Comparison in susceptibility of Anopheles dirus and Anopheles stephensi to B strain of Plasmodium cynomolgi

This paper reports on the comparative susceptibility of A. dirus (Hainan strain) and A. stephensi (Hor strain) to the B strain of P. cynomolgi in paired feeding experiments. In the most susceptible infective period, the infection rate in midgut and salivary gland of the two species was over 90%, the difference is not statistically significant. In relatively infective period, three experiments were performed, the infection rate in midgut of A. dirus was 24.4-60.4% with an average of 46.5% (53/114), and that of A. stephensi was 11.5-21.1% with an average of 14.2% (16/113). Statistically, experiment I showed no significant difference, the difference in experiment II was highly significant (P less than 0.01), and that in experiment III was significant (P less than 0.05). The number of oocysts in A. dirus was three times over that in A. stephensi. The infection rate of salivary gland in A. dirus was 18.2-55.0% with an average of 30.6% (19/62) and that of A. stephensi was 6.7-14.3% with an average of 9.5% (6/63). Statistically, only one of the three experiments showed significant difference (P less than 0.01). The result suggests that the susceptibility of A. dirus is higher than that of A. stephensi to the B strain of Plasmodium cynomolgi.