Bench Aids for the Diagnosis of Intestinal Parasites published in 1994 by the WHO (ISBN - 92 4 1544767) is a good all around manual for the identification of all intestinal parasites. It includes methods for preserving and staining fresh, PVA and SAF fixed stool samples as well as excellent photographs of stained specimens. However, it must be remembered that E. histolytica and E. dispar cannot be distinguished morphologically. The description provided applies to both of them, except for red blood cell ingestion and tissue invasion.

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