Bengal logs highest one-day spike of 20,846 COVID-19 cases, 139 more fatalities

At least 19,131 recoveries were recorded in the state since Thursday.

May 14, 2021 / 10:43 PM IST

West Bengal on Friday registered its highest single-day spike of 20,846 fresh COVID-19 cases, taking the tally to 10,94,802, the health department said in its bulletin.

The toll rose to 12,993 after 136 more people succumbed to the disease, it said.

At least 19,131 recoveries were recorded in the state since Thursday.

Accordingly, the number of active cases climbed to 1,31,792.

As many as 70,051 samples have been tested in the state over the past 24 hours, the bulletin added.

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COVID-19 Vaccine

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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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