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Medium-sized bronchiole from a 4-week-old pig 5 days p.i. with Sw/CO/99 virus (cluster II). The bronchiole is almost completely denuded with the remaining epithelial cells attenuated and irregularly distributed. Low numbers of infiltrating lymphocytes are around the bronchiole and are mixed with neutrophils in adjacent partially collapsed alveoli (magnification, ×149).
