. A group of 2-week-old dairy calves develop watery diarrhea that is unresponsive to antibiotic therapy. A fecal sample contains round 2- to 4-cm bodies that are acid-fast-positive. Which of the following is the most likely causative organism?
(A) Cryptosporidium spp
(B) Escherichia coli O157:H7
(C) Mycobacterium spp
(D) Nocardia spp
(E) Salmonella spp
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