Both Covishield and Covaxin vaccines are effective against the UK and the Brazilian variants of coronavirus, while the work against the South African strain was on at several laboratories, the Centre said on Tuesday.
Addressing a weekly press conference of the Union health ministry, ICMR Director-General Balram Bhargava also said of 11,064 genome samples sequenced in the country, the UK variant of the virus was detected in 807, the South African variant in 47 and the Brazilian variant was found in one.
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"Both the vaccines - Covishield and Covaxin- are effective against the UK and the Brazilian variants and the work against the South African variant is ongoing at several laboratories," he said.
Frequently Asked Questions
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.
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.
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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Bhargava further said that mutations are sporadic and single mutations are not found to be dominant in any particular area in India.
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"In terms of significance of the point of double mutations they are not significant as far as India is concerned and their relationship with increased severity or increased transmissibility has not been established in Indian context," he said.
Responding to another question, Union Health Secretary Rajesh Bhushan said there is no Indian strain of coronavirus.
Noting that there are two concepts -concept of virus shift and virus drift, Bhushan said all viruses drift as the virus replicates itself but the changes that occur due to this process are not important and it does not call for any rapid change in the public response strategy.
He also said that it was "natural and inevitable phenomenon" that a virus that has been around for more than a year, travelled through more than one crore people, will obviously undergo change. This is not a cause to panic, he added.
"However, when a virus shifts it undergoes significant changes and there is a need to test whether my existing vaccines work against the virus, known as variant or mutant virus," he explained.
Last week, the Union health ministry said the new "double mutant" variant of SARS-CoV-2 was detected in Delhi, Maharashtra and some other places in addition to the three "variants of concern" -- first noticed in the UK, South Africa and Brazil -- that have been found in at least 18 states and union territories.
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