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Mean M. hyopneumoniae IgG (A) and IgA (B) OD values (±SD) in BALF samples from animals of the experimental study with and without CVPC at 21 and 28 dpi. Different superscripts indicate significant differences of antibody levels among animals with and without CVPC at 21 and 28 dpi (p<0.05). Discontinuous line represents the positivity threshold.
