Assertion: cystic fibrosis's condition | /r/HasProperty | fatal
Facets:
value: historically
type: TEMPORAL
Source sentences:
text: Eventually the condition can be fatal if it leads to a serious infection or the lungs stop working properly.
text: As the condition has historically been lethal, it is widely assumed that the carrier state (a single CFTR mutation) must have afforded a survival advantage to certain populations.