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Medical Definition of Katayama fever
1. Acute early egg-laying phase of schistosomiasis, a toxaemic syndrome in heavy primary infections, rarely seen in chronic cases. It is considered a form of immune complex disease or serum sickness-like condition. Described for schistosomiasis japonica, but observed with other forms as well. Synonym: Katayama fever. Origin: town in Japan where the d. Is common (05 Mar 2000)