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Regional distribution of mean bronchiolar area in the four groups of piglets. Data were expressed as mean ± standard error of the mean. P < 0.001 = interaction between lobes and dependence of the lung. D, dependent regions; ND, non-dependent regions; NS, not significant; NVI, non-ventilated-inoculated piglets; VI, ventilated-inoculated piglets; VNI, ventilated-non-inoculated piglets.
