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Evaluation of histopathological changes in the lung after immunization and viral challenge. Lungs were harvested 8 d after RSV A2 challenge and stained with hematoxylin and eosin to assess histological changes. The lung sections from days (A) 4 and (B) 8 were scored as described in the methods section, and (C) representative photomicrographs are shown. Bars represent mean ± 95% CI.
