Assertion: salk vaccine | /r/HasProperty | 60–70% effective
Facets:
value: against pv1
type: TRANSITIVE-OBJECT
Source sentences:
text: The Salk vaccine had been 60–70% effective against PV1 (poliovirus type 1), over 90% effective against PV2 and PV3, and 94% effective against the development of bulbar polio.