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Development of mean clinical scores and the proportion of pigs exhibiting clinical signs in the group inoculated with both porcine respiratory coronavirus (PRCV) and lipoteichoic acid (LTA) (PRCV–LTA) (continuous line) compared to groups inoculated with either PRCV (long-dashed line) or LTA (short-dashed line). * One animal from each group was euthanased from this time onwards. The X axis signifies hours after inoculation with PRCV (before the slash) and LTA (after the slash).
