Volume 13, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Evidence is presented of high leptospiral carrier rates in and trapped on the Island of Hawaii. A high incidence of culture-positive, seronegative rodents is reported and possible explanations are offered in terms of balance between host and leptospiral factors. Isolations of and from the mongoose (), of from , and of in the Western Hemisphere are reported for the first time. , the predominant serotype, was isolated from rodents having higher blood agglutination titers to other leptospiral serotypes; this is attributed either to infection with a second serotype or to the so-called “paradoxical reaction.” Male and had slightly higher leptospiral infection rates than did the females; male were infected more than twice as often as were females; and older rats of all species were infected more than three times as often as were juveniles.


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