word
Vaccine Efficacy
vak-SEEN EF-ih-kuh-see
/vækˈsiːn ˈɛfɪkəsiː/Listen
Hear it in a clear American voice. Slow it down to catch each syllable.
Syllable breakdown
vaccineefficacy
Dictionary meaning
The percentage reduction of disease in vaccinated individuals compared to unvaccinated individuals under controlled trial conditions
Examples
- The vaccine showed 95% efficacy in preventing symptomatic disease in clinical trials.
Pronunciation tips
Efficacy (trial setting) vs. effectiveness (real-world setting) — related but distinct terms.
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