virus covid-19 vaccine

Vaccine efficacy, effectiveness and protection

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www.who.int

This article is part of a series of explainers on vaccine development and distribution. Learn more about vaccines – from how they work and how they’re made to ensuring safety and equitable access – in WHO’s Vaccines Explained series.COVID-19 vaccines have proven to be safe, effective and life-saving.

Like all vaccines, they do not fully protect everyone who is vaccinated, and  we do not yet know how well they can prevent people from transmitting the virus to others.

So as well as getting vaccinated, we must also continue with other measures to fight the pandemic. Vaccine efficacy and effectivenessAll COVID-19 vaccines approved by WHO for emergency use listing have been through randomized clinical trials to test their quality, safety and

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