Fig. 6From: Immunity against a Japanese local strain of porcine reproductive and respiratory syndrome virus decreases viremia and symptoms of a highly pathogenic strainGross and microscopic lung lesions in pigs at 16 days post-infection with 10,186–614. Gross lung lesions (%) (a) and microscopic lung lesions (score) (b) are shown in each group with mean ± standard error (SE). Statistically significant differences between Groups 2 and 3 are indicated (††P < 0.01). C: Upper panels show the left dorsal surface of the lungs; lower pictures show moderate to severe interstitial pneumonia (hematoxylin and eosin staining, bar = 200 μm) in pigs of Groups 2 and 3Back to article page