assessment of immediate and delayed hypersensitivity skin tests with schistosoma mansoni adult worm antigen in a rural egyptian population.immediate and delayed hypersensitivity responses to schistosome adult worm skin test antigen were assessed in 418 farmers in dakahlia governorate, egypt. all were from a population frame being epidemiologically evaluated for bilharzial urinary bladder cancer and thus were all 20 years old or older. a control, group of 108 adult urban dwellers without antecedent or current history of schistosomiasis were also tested. ninety eight percent (411/418) of farmers and 35% (38/108) of controls showed re ...19807210159
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