Assertion: hepatitis's blood transfusion | /r/HasProperty | major factor
Facets:
value: in the 1970s
type: TEMPORAL
value: in spreading hepatitis c virus
type: TRANSITIVE-OBJECT
value: in 1980s
type: TEMPORAL
Source sentences:
text: In the 1970s and 1980s, blood transfusions were a major factor in spreading hepatitis C virus.