FIG. 2.

Extent of gross lung lesions in the infected piglets. Lung lesions at 5 and 7 dpi in the 1930/rec and 1918/rec virus-infected animals and in the 1918/rec virus-inoculated pigs also at 12 (pig 106) and 17 (pigs 107 and 108) dpi. Total extent of the lung lesions (white columns) and the extent of the lesions in the diaphragmatic lobes (black columns) are given as the total lung surface percentage for individual animals. While the macroscopic lesions in the lungs of the 1930/rec virus-infected animals did not appear to be spreading, the lung lesions in the 1918/rec virus-infected animals were more extensive later times postinfection (after 7 dpi).