these techniques included : 1 ) assessing the percentage of lung involved and calculating a mean percentage and standard deviation for each herd , 2 ) counting the number of lungs in the herd sample that have greater than a predetermined amount of pneumonia and calculating the prevalence of the sample thus affected , 3 ) scoring only the lung from each herd sample that was maximally affected by pneumonia , and 4 ) allocating lungs to categories depending on the approximate extent of pneumonia .
C0024109
lungs
C0032285
pneumonia