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Published online by Cambridge University Press: 15 May 2009
Cervical buboes preponderate, on the one hand, in naturally infected rats and in guinea-pigs infected by being placed in plague-infected houses and also in rats and guinea-pigs artificially infected with fleas. In rats artificially infected by feeding mesenteric buboes are the most frequent, whereas in upwards of 5000 naturally infected rats in not a single case was a mesenteric bubo present. It may, therefore, be concluded that rats in nature are not infected by feeding on plague-infected material, but probably by the agency of fleas.