HomeNewsTrendsHealthCOVID vaccine EUL recommendation process sometimes takes longer: WHO official says as Covaxin decision awaited

COVID vaccine EUL recommendation process sometimes takes longer: WHO official says as Covaxin decision awaited

The World Health Organisation is very clear that we want all countries to recognise vaccines that have been given an Emergency Use Listing (EUL) by the WHO advisory process.

October 22, 2021 / 12:34 IST
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 Vial of Covaxin (File image)
Vial of Covaxin (File image)

As a decision is awaited on the Emergency Use Listing of Covaxin being manufactured in India, a top WHO official has said the process of thoroughly evaluating a vaccine for use and recommending it sometimes takes longer time but it has to be ensured that the right advice is given to the world "even if it takes another week or two”.

The World Health Organisation is very clear that we want all countries to recognise vaccines that have been given an Emergency Use Listing (EUL) by the WHO advisory process.

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But it’s also very important that WHO, when it makes a recommendation like that, is making that globally, WHO Health Emergencies Programme Executive Director Dr Mike Ryan said.

Ryan was responding to a question during a recent virtual Q&A on whether there will be a definitive answer on Covaxin EUL by October 26.

COVID-19 Vaccine
Frequently Asked Questions

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How does a vaccine work?

A vaccine works by mimicking a natural infection. A vaccine not only induces immune response to protect people from any future COVID-19 infection, but also helps quickly build herd immunity to put an end to the pandemic. Herd immunity occurs when a sufficient percentage of a population becomes immune to a disease, making the spread of disease from person to person unlikely. The good news is that SARS-CoV-2 virus has been fairly stable, which increases the viability of a vaccine.

How many types of vaccines are there?

There are broadly four types of vaccine — one, a vaccine based on the whole virus (this could be either inactivated, or an attenuated [weakened] virus vaccine); two, a non-replicating viral vector vaccine that uses a benign virus as vector that carries the antigen of SARS-CoV; three, nucleic-acid vaccines that have genetic material like DNA and RNA of antigens like spike protein given to a person, helping human cells decode genetic material and produce the vaccine; and four, protein subunit vaccine wherein the recombinant proteins of SARS-COV-2 along with an adjuvant (booster) is given as a vaccine.

What does it take to develop a vaccine of this kind?

Vaccine development is a long, complex process. Unlike drugs that are given to people with a diseased, vaccines are given to healthy people and also vulnerable sections such as children, pregnant women and the elderly. So rigorous tests are compulsory. History says that the fastest time it took to develop a vaccine is five years, but it usually takes double or sometimes triple that time.
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