Rapid dimethyl sulfoxide-modified acid-fast stain of Cryptosporidium oocysts in stool specimens

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Abstract
A rapid dimethyl sulfoxide modification of an acid-fast technique was applied to direct fecal smears to monitor cryptosporidiosis in nonhuman primates. Brilliantly stained pink oocysts against a pale green background demonstrated well-preserved internal morphology and facilitated rapid, simple, noninvasive diagnosis without fluorescent or phase-contrast microscopy.