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Coronvirus Essential | Worldwide number of cases reaches 3 million; COVID-19 could keep returning like flu, Chinese scientists say

Tune in to the Coronavirus Essential podcast by Shraddha Sharma for the top updates .

April 28, 2020 / 06:53 PM IST

The number of confirmed cases in India approaches 30,000 and the world total has crossed three million.

Many industries in India, including auto, have resumed operations with 50 percent capacity.

While the world is still looking for ways to curb the infection and go back to normal, Chinese scientists have suggested that coronavirus could a recurring disease like the flu.

Tune in to the Coronavirus Essential podcast by Shraddha Sharma for more.

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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first published: Apr 28, 2020 06:53 pm