Leptospirosis, also known as the infectious jaundice or Weil' s disease, may occur sporadically as an occupational disease particularly among fish-cutters, slaughterhouse workers, miners, and sewer workers, or as a water-borne disease. Whatever the form may be, the primary source of infection comes chiefly, if not solely, from the sewer rat, Rattus norwegicus. (Black rats, mouse, vole, and bandicoot have also been found to carry this organism.) The L. icterohaemorrhagiae are harbored in the kidneys of the rats and discharged in the urine.
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