Assertion: lassa fever | /r/HasProperty | given medical description
Facets:
value: in the 1950s
type: TEMPORAL
Source sentences:
text: Lassa fever was first given medical description in the 1950s but the causative viral particle was first identified in 1969 from three missionary nurses who fell ill and died after caring for an infected obstetrical patient in the town of Lassa, Borno State, Nigeria, West Africa.