noun · academic
efficacy
UK/ˈefɪkəsi/US/ˈɛfɪkəsi/EF·fi·ca·cy
the ability of an intervention to produce the desired effect under controlled conditions
Examples
“Phase III trials are the main way to measure a vaccine's efficacy.”
“High efficacy in trials does not guarantee the same effect in the real world.”
“The drug showed good efficacy against the targeted disease.”
Band 8 sentence
“Although the vaccine demonstrated high efficacy in randomized trials, post-marketing surveillance assessed its effectiveness across populations.”
Collocations
- efficacy of the vaccine
- demonstrate efficacy
- high efficacy
Word family
Common mistakes
efficiency of the drug→efficacy of the drug
effectiveness in trial→efficacy in trial
Say it for a higher band
5effect→6effectiveness→7+efficacy
Synonyms
effectiveness
Easily confused
effectiveness
“A vaccine can have high efficacy in clinical trials but lower effectiveness in the general population.”
Related words
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