Yang, James and Scholten, Theodore: A fixative for intestinal parasites permitting the use of concentration and permanent staining procedures. Am J Clin Pathol 67: 300–304, 1977. Results obtained with stools preserved in a simple, stable and relatively nontoxic fixative (SAF) composed of sodium acetate, acetic acid and formalin, suggest that this fixative is a suitable alternative to other fixatives for the preservation and recovery of intestinal parasites by diphasic concentration methods and permanent staining.
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Yang et al. (1977) studied this question.