Leptospira icterohaemorrhagiae in Oxford Rats

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Abstract
41·7 per cent. of the rats in the Oxford district were found to carry Leptospira icterohaemorrhagiae in their kidneys. The percentage infection increases until the animals are mature, reaching a maximum of 56 per cent. among one class of the population, but is less among the oldest rats. There is evidence that the organism is acquired comparatively early in life, and that immunity is obtained after a long period of infection.