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Fecal shedding of EHEC O157:H7 by experimentally infected weaned calves. Six calves were housed in each of two separate HSU rooms. Four calves in each HSU room were dosed with EHEC O157:H7 (strain 9000 in one room and strain 10671 in the other) by orogastric intubation (challenged), while two calves in each room received PBS only (sentinel). Each curve represents an individual animal. Arrowheads indicate rectal biopsy time points.
