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India Coronavirus Dispatch: What does '90% efficacy' for a vaccine mean?

Students aspiring to study abroad may face tougher competition in 2021, AstraZeneca's manufacturing error casts doubt over its potential, and other news relevant to India's fight against the pandemic

Photo: Reuters
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Different pharmaceutical companies are now coming out with the success stories of their potential vaccines, and the efficacy rates of these vaccines are reported to be high – 70%, 90%, 95%, and so on. Photo: Reuters

Bharath Manjesh New Delhi
What does ‘90% efficacy’ for a Covid-19 vaccine mean?

Different pharmaceutical companies are now coming out with the success stories of their potential vaccines, and the efficacy rates of these vaccines are reported to be high – 70%, 90%, 95%, and so on.  Such figures for potential vaccines under trial are never very clear to common people unless their implications are clearly illustrated. Here is how we can understand vaccine efficacy. Read more here

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