In this study, the purified and concentrated oocysts were isolated from the faecal samples by density gradient centrifugation.

• 本研究以不同密度的蔗糖溶液为介质，按比例配制两种密度的分离液，对采自广东省的奶牛粪便进行分离纯化，得到了较纯净的牛源环孢子虫卵囊；