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Macroscopical aspect of lymph nodes two days after inoculation of either saline, ∼5500 Y. pseudotuberculosis cfu or ∼5500 Y. pestis cfu. Lymph node from Y. pseudotuberculosis-infected mice is purulent whereas Y. pestis-infected lymph node is reddish and adherent to neighboring tissues. Bar = 2 mm.
