另一感染性因素，更常发生于免疫缺陷病人，特别是有获得性免疫缺陷综合症（艾滋病）的病人。在内腔边界的小圆兰色的生物体是隐孢子虫。隐孢子虫病会引起大量的水样便。
This is another infectious agent that is becoming more frequent in immunocompromised patients, particularly those with AIDS. The small round blue organisms at the lumenal border are cryptosporidia. Cryptosporidiosis produces a copious watery diarrhea.
