Assertion: vaccine's efficacy | /r/CapableOf | decrease to just 18%
Facets:
Source sentences:
text: For people 60 to 69 years of age, 64% are protected against the rash; for those 70 to 79 years of age, the rate falls to 41%; and for those 80 years of age and older, Zostavax’s efficacy decreases to just 18%.