HomeNewscoronavirusAmid global spurt in Covid-19 cases, Centre asks states to increase genome sequencing of positive samples

Amid global spurt in Covid-19 cases, Centre asks states to increase genome sequencing of positive samples

In a letter to states and UTs, Union Health Secretary Rajesh Bhushan said such an exercise will enable timely detection of newer variants, if any, circulating in the country

December 20, 2022 / 19:34 IST
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Representative image
Representative image

Amid a sudden spurt in COVID-19 cases in Japan, South Korea, Brazil, China and the US, the central government on Tuesday urged all states and Union territories to gear up the whole genome sequencing of positive samples to keep track of emerging variants.

In a letter to states and UTs, Union Health Secretary Rajesh Bhushan said such an exercise will enable timely detection of newer variants, if any, circulating in the country and will facilitate undertaking of requisite public health measures.

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He highlighted that India with its focus on the five-fold strategy of test-track-treat-vaccination and adherence to Covid-appropriate behaviour has been able to restrict the transmission of the coronavirus and is having around 1,200 cases on a weekly basis.

Public health challenge of COVID-19 still persists around the world with around 35 lakh cases reported weekly, Bhushan said.

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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