人芽囊原虫是一种广泛寄生在人体和灵长类动物肠道内的寄生原虫［１］，过去曾被误认为是对人体无害的酵母。近代许多研究表明，人芽囊原虫能引起人体肠道疾病，为了解洛阳地区人群感染人芽囊原虫的情况，采用直接涂片和碘染色法对部分洛阳市郊蔬菜种植区的３个自然村部分... Blastocystis is a parasitic protozoan widely parasitic in the gut of humans and primates [1], a yeast that in the past was mistakenly thought to be harmless to the human body. In recent years, many studies have shown that human Blastocystis can cause intestinal diseases in humans. To understand the infection of human Blastocystis in Luoyang, direct smear and iodine staining were applied to the part of three natural villages in some vegetable growing areas in Luoyang suburbs. ..