Abstract
To the Editor: Cryptosporidium species have recently been recognized as a cause of gastrointestinal disease in both immunocompromised and immunocompetent persons.1 , 2 Since February 1, 1983, all stool specimens submitted to our Clinical Parasitology Laboratory for ova and parasite examination have been screened for cryptosporidium by a modified acid-fast method.3 We wish to report an association between the presence of cryptosporidium and Giardia lamblia in stool.As of November 1, 1983, cryptosporidium had been identified in stool specimens from 33 of 1290 patients (2.6 per cent). For five patients, positive findings were verified by Sheather's sugar-flotation method.4 Five of the 33 . . .

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