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No need for fourth dose of COVID-19 vaccine given current evidence: Dr Gangakhedkar

Dr Gangakhedkar has appealed to follow two things including taking a precautionary dose and taking all the precautions for those who are in a vulnerable group.

January 25, 2023 / 06:49 IST
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(Representative image: Reuters)

Dr Raman Gangakhedkar, former head of epidemiology and communicable diseases at the Indian Council of Medical Research (ICMR), on Tuesday, discounted the need to take the fourth dose of COVID-19 vaccine given the current evidence regarding the coronavirus and variants.

"Looking at the current evidence (of variants of the virus), it is not that big that there is any need for the fourth dose of the COVID-19 vaccine. There are many reasons for that. Currently, whatever vaccines are there, the virus makes the escape mutants over them which causes infections," Dr. Gangakhedkar said on the sidelines of a function.

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He said if a person has taken a third dose of the anti-COVID-19 vaccine that means his T-cell immune response has been trained thrice.

"The core virus (of COVID) has not been changed so much that a new vaccine would be needed so try and have trust in our T-cell immune response," he added.

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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