
疟疾是由蚊虫传播的疟原虫感染引起的寄生虫性疾病,人群普遍易感。根据世卫组织2023年的报告显示,全球每年仍有2.5亿例疟疾病例,并有超过60万的死亡病例,在非洲撒哈拉以南的广袤土地上,每60秒就有一名儿童死于疟疾。按蚊叮咬感染者时,疟原虫配子体会通过血液感染按蚊,在到达蚊胃后激活并继续发育形成动合子,而后穿透按蚊中肠上皮形成卵囊,当卵囊发育成熟后,囊内子孢子释放并侵入按蚊的唾腺中,当按蚊再次吸食人血时,子孢子就可以随唾液进入人体形成感染。然而,从动合子穿透按蚊的中肠上皮转化为卵囊的18-24小时期间,是疟原虫生命周期中最脆弱的时期,极易被免疫系统杀死。经研究,科学家发现一种名为PfPIMMS43的表面蛋白在此过程中可以帮助疟原虫逃避免疫系统攻击。
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