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Histology of lungs after intranasal infection with Y. pestis strain CO92. Lungs were inflated and fixed with 10% formalin, and 5-μm sections were stained with hematoxylin/eosin. Lungs were examined from uninfected mice or mice infected with 1 × 104 cfu Y. pestis for 24, 48, or 72 h. (Scale bars, 50 μm.)
