Comparative expression of Toll-like receptors and inflammatory cytokines in pigs infected with different virulent porcine reproductive and respiratory syndrome virus isolates

Table 1 The clinical sign scores of the pigs after challenge and their lung lesions recorded at 15 d.p.i. ^a

^aWithin each column, values followed by different letters (A, B) are significantly different (p < 0.05).
^bClinical sign scores are the sum of daily observations of behavior, respiration, and cough according to the severity of the illness.
^cEvaluation of the percentage of the entire lung affected by pneumonia.