Investigations in the Mossman districts of North Queensland showed the maintaining hosts of leptospiral serotype medanensis to be Perameles nasuta and Isoodon macrourus in canefields, secondary woodland and rain forest. Rattus sordidus conatus is the maintaining host of grippotyphosa in canefields. The host range of six serotypes was extended by the cultural studies.
We would like to express our thanks to Dr G. Alberts, superintendent of Mossman District Hospital, for his co-operation, and also to Miss H. MacDonald and Mr A. Wood for technical assistance.