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The fecal shedding levels of piglets in IR, IS, and IC groups from 0 to 5 days post challenge (dpc). Fecal shedding CFUs were determined by plate count method. The horizontal line represents the mean. Green circle represents results of IC; Red circle represents results of IR; Blue circle represents results of IS. An asterisk denotes a significant difference (*P < 0.05; **P < 0.01).
