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Hematoxylin-and-eosin-stained paraffin wax cut lung tissue sections from BALB/c (A) and CBA/Ca (B) mice 12 h following infection with S. pneumoniae D39. PB and PV indicate areas of peribronchial and perivascular cellular infiltration. CBA/Ca mice showed some evidence of interstitial alveolitis (IA), but in BALB/c mice interstitial alveolitis was more severe.
