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Table 2 Results of the histopathological examination of lungs

From: Characterization of homologous and heterologous adaptive immune responses in porcine reproductive and respiratory syndrome virus infection

Experiment Group Interstitial pneumonia*
1 C1 + B 5.0 ± 2.8a
A + A 6.5 ± 3.8a
  A + B 6.8 ± 1.3a
2 C2 + A 8.7 ± 2.3b†
B + B 6.5 ± 2.6a
  B + A 5.3 ± 0.6a
  1. Different superscript letters indicate significant differences (p < 0.05) between the groups in a given experiment according to the Kruskal-Wallis test (Conover-Inman test for multiple comparisons). No significant differences were seen for the double challenged groups between experiment 1 and 2.
  2. * Microscopic interstitial pneumonia was evaluated in 4 portion of lung corresponding to the apical, cardiac, diaphragmatic and intermediate lobes, scored in a 4-grade scale (0 = absent to 3 = severe). The values shown correspond to the average of the summatory of scores for each pig in a given group and the standard deviation of the summatories. With this calculation, maximum possible average is 12.
  3. † In the case of group C2 + A; p = 0.06.