简称弓形虫,弓浆虫。寄生于人和许多种动物的有核细胞,引起人畜共患的弓形虫病(toxoplasmosis) 。特别在宿主免疫功能低下时致病,属机会致病原虫(opportunisticprotozoa)刚地弓形虫(Toxoplasma gondii )一、形态在发育过程中,有5 种形态。滋养体 在有核细胞内,假包囊内滋养体叫速殖子tachyzoite 包囊 cyst 大量虫体分泌物形成的囊状结构,包囊内滋养体 叫缓殖子bradyzoite卵囊oocyst 内含2 个孢子囊,每个孢子囊内含4 个子孢子。裂殖体配子体Toxoplasma gondiiinthebronchoalveolarlavage(BAL)materialfromanHIVinfectedpatient.Numeroustrophozoites(tachyzoites)canbeseen,whicharetypicallycrescentshapedwithaprominent,centrallyplacednucleus.Mostofthetachyzoitesarefree,somearestillassociated