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How to pronounce "efficacy"

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they were characterized as high efficacy,

ted-talks_1060_ThomasGoetz_2010P-320k

Duration: 3s Details

for two months without loss of efficacy of the penicillin.

ted-talks_1142_FioOmenetto_2011-320k

Duration: 4s Details

of change in efficacy and if it actually makes an impact

ted-talks_1516_VinayVenkatraman_2012S-320k

Duration: 4s Details

Then six months later, the data comes back: no efficacy.

ted-talks_2137_NancyFrates_2014X-320k

Duration: 5s Details