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Biopsies after treatment for 13 days. (a, b) Colonic biopsy showing crypt regeneration and epithelial apoptotic bodies (arrows) (inset in a: endoscopic appearance). (c, d) Duodenal biopsy showing rare organisms of cryptosporidium (arrows) and highlighted by AFB (acid-fast) stain (d) (a: × 100; b, c: × 400; d: original, × 600).
