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Severity of lung infection in the four groups of piglets. Data are expressed as the percentage of infected secondary pulmonary lobules corresponding to a given category of pneumonia. White bar represents healthy lung, light gray bar represents focal pneumonia, dark gray bar represents confluent pneumonia, and black bar represents purulent pneumonia. C, control piglets; NVI, non-ventilated-inoculated piglets; VI, ventilated-inoculated piglets; VNI, ventilated-non-inoculated piglets.
