Assertion: vaccine's effect | /r/CapableOf | kill 12 of 21 children
Facets:
value: in one 1928 incident
type: TEMPORAL
Source sentences:
text: Many vaccines need preservatives to prevent serious adverse effects such as Staphylococcus infection, which in one 1928 incident killed 12 of 21 children inoculated with a diphtheria vaccine that lacked a preservative.