Abstract
This article examines the basis of ethnomedical classification of diarrheal disease among the Swahili speaking population of Lubumbashi, Zaire and the association of specific diagnoses with treatments given. Results from two research methods are reported: group interviews and large sample surveys. A series of group interviews with mothers of small children provided information about how they commonly diagnose illnesses related to childhood diarrheal disease as well as which symptoms, causes, and treatments they associate with those illnesses. Data from the interviews were used to formulate questions about the diagnosis of illness and treatments given for recent cases of diarrhea. A baseline and a follow‐up survey provided information about the symptoms associated with reported episodes of illness and about the treatments given at home. The results provide evidence that ethnomedical diagnoses are based on observed symptoms, that they affect how and why oral rehydration therapy (ORT) is used or not used for diarrhea, and that the terms chosen by survey researchers to ask about diarrhea and ORT may affect survey results in predictable and systematic ways.