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HomeNewsIndiaCOVID-19 Vaccine Tracker: 16 lakh doses administered in India on May 22
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COVID-19 Vaccine Tracker: 16 lakh doses administered in India on May 22

The COVID-19 vaccination drive for the 18-44 age group was paused in Delhi on May 22 due to a shortage of doses

May 23, 2021 / 08:36 IST
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Two doses from either the Oxford-AstraZeneca or the Pfizer COVID-19 vaccine are over 80 percent effective in preventing infection from the B1.617.2 variant of coronavirus, first discovered in India, a new UK government study has reportedly found (Representative image)

More than 16.04 lakh COVID-19 vaccine doses were administered in India on May 22, the Union Health Ministry's latest provisional report suggested. With that, the cumulative number of COVID-19 vaccine doses administered in the country reached 19.5 crore.

On the 127th day of the vaccination drive (May 22), 14.22 lakh beneficiaries received their first shot and 1.81 lakh people were given their second dose.

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The government has revised the gap between the two doses for the Oxford-AstraZeneca's Covishield, being manufactured by the Serum Institute of India, to 12-16 weeks. However, the interval for the second dose of Bharat Biotech's Covaxin remains unchanged.

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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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