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Mean alveolar and mean bronchiolar areas in the four groups of piglets. Mean alveolar area was measured in aerated lung regions (left panel), and mean bronchiolar area was measured in aerated and non-aerated lung regions (right panel). Data are expressed as median and 25% to 75% interquartile range. *p < 0.05 between two groups. NVI, non-ventilated-inoculated piglets; VI, ventilated-inoculated piglets; VNI, ventilated-non-inoculated piglets.
