In contrast to these findings on fresh stool, Goldman and Brooke (1953) claim that trophozoites are to be found in faeces preserved with polyvinyl alcohol (P.V.A.), though it is not clear from their report whether E. histolytica is included in this category; and Brooke, Donaldson, and Brown (1954fixation for trophozoites in conjunction with form'ol-
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Marshall et al. (1956) studied this question.
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