一、前言在实验动物中发现,将肿瘤移植于已患肿瘤的动物体内,则该动物不能阻止原来的肿瘤不断生长,却能抵抗移植的肿瘤,称为伴随免疫。在血吸虫的免疫中也存在类似现象,也称为伴随免疫,即宿主经过初次感染血吸虫后能产生对再感染的抵抗力,但这种抵抗力不能破坏初次感染的成虫,也不能阻止其产卵。血吸虫的伴随免疫是由于体液免疫和细胞免疫的协同作用,其效应机理至少涉及抗体、补体、嗜酸性粒细胞和巨噬细胞等的协同作用。近年来的研究肯定 I. INTRODUCTION It has been found in experimental animals that when the tumor is transplanted into an animal that has already developed the tumor, the animal can not stop the original tumor from growing continuously, but can resist the transplanted tumor and is called concomitant immunity. A similar phenomenon also exists in the immunization of schistosomiasis, also known as concomitant immunity, in which the host produces resistance to reinfection after the first infection with schistosomes, but this resistance does not destroy the first infected adult or prevent its . The accompanying immunity of schistosomiasis is due to the synergistic effect of humoral immunity and cellular immunity. Its effector mechanism involves at least the synergy of antibodies, complement, eosinophils and macrophages. In recent years, research is certainly