autumn fever

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mud fever

a type of leptospirosis occurring in the summer and autumn in Germany and Russia, caused by Leptospira interrogans; it is transmitted to humans by the field mouse Microtus arvalis and affects mainly workers in swamps or flooded fields. Called also autumn fever.

au·tumn fe·ver

1. a fever resembling dengue that occurs at the end of the summer in India; Synonym(s): seven-day fever (1)
2. Synonym(s): hasamiyami