pneumonia were observed in Hillcrest and Beaufort inoculated pigs at 21 and 28 days post-challenge, and a significant correlation (P < 0.0001; r = 0.96) was found between Goodwin lung score and percentage affected lung in the log-transformed data from 13 pigs with gross lung lesions. On day 21, lesions were located in the right apical,right cardiac, left apical and/or accessory lobes of Hillcrest and Beaufort challenged pigs.