以贵州省的4例间日疟病例为供血者,先后感染7批大劣按蚊,用扫描电镜观察蚊虫感染疟原虫后9、11、12d的孢子增殖期。卵囊表面特征与其它疟原虫相似。卵囊壁内侧面粗糙并有许多棘状突起。早期成孢子细胞芽生短锥状子孢子芽,而后渐伸长如棒状而至变为长形。子孢子呈细长形,虫体弯曲,质膜表面光滑,体前端稍平。微孔位于距虫体前端约1/3处。 Seven mosquitoes were infected with Plasmodium falciparum in 4 cases in Guizhou Province. The sporulation of mosquitoes infected with Plasmodium was observed at 9, 11 and 12 days with scanning electron microscopy. Oocyst surface characteristics similar to other Plasmodium. The inner surface of the oocyst wall is rough and has many spines. Early sporozoites sprouting short conidia spores buds, and then gradually elongated like a rod and become long. Sporozoites were slender, parasites bent, the plasma membrane surface smooth, slightly flat front of the body. Micropore is located about 1/3 from the front of the body.