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Lungs of a noninfected control hamster (A) are compared with lungs of a hamster intraperitoneally infected with virulent L. interrogans serovar Icterohaemorrhagiae strain Verdun and euthanatized at 2 days p.i. (B) or 4 days p.i. (C). The arrows show isolated (B) or confluent (C) hemorrhagic areas.
