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Viral load in the lungs (A, B) and tracheobronchial lymph nodes (C, D) on days 14 and 28 after challenge. Homogenized samples were tested for the presence of PRRSV RNA by RT-qPCR assay. When 2 sets of data are labeled with superscripts of different letters or when only one set is labeled with a superscript, it indicates that these 2 sets of data are statistically different (P < 0.05)
