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Twenty years ago the arenavirus Lassa fever virus was identified as the cause of three serial, nosocomial cases of hemorrhagic fever in nursing personnel at a mission hospital in Jos, Nigeria. A subsequent outbreak there was thought to be a result of aerosol transmission to patients and family members on an open ward from a patient with pneumonia and the protean manifestations of Lassa fever,1 a disease that is fatal in up to half the patients in West Africa who have it. Aerosol transmission was not ruled out in another outbreak, in Liberia. Thus, the possibility that Lassa fever might . . .
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Johnson et al. (1990) studied this question.
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