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COVID-19 in Delhi: 758 fresh cases, lowest since August 16; positivity rate 0.88%

From December 21-23, the daily case count had been below the 1000-mark.

December 25, 2020 / 09:48 PM IST

Delhi has recorded 758 fresh COVID-19 cases, the lowest in over four months, and 30 new fatalities even as the positivity rate dipped to 0.88 per cent, authorities said Friday. The infection tally in the city mounted to over 6.21 lakh and death toll rose to 10,414, they said, adding that over 85,000 tests were conducted the previous day.

This is also the lowest positive rate in over eight months. The previous low being 0.99 per cent on December 23.

From December 21-23, the daily case count had been below the 1000-mark. On Monday, 803 cases were reported, the lowest since August 17; on Tuesday 939 cases were reported and 871 on Wednesday.

However, on Thursday 1,063 cases were recorded, dropping again on Friday.

These 758 caseswere diagnosed following the 85,749 tests conducted the previous day, including 45,521 RT-PCR tests and 40,228 rapid antigen tests,according to the latest bulletin issued by the Delhi health department.

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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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On August 17, Delhi had recorded 787 cases, and 652 on August 16.

The active cases tally on Friday dropped to 7,267 from 7,909 on Thursday.

The bulletin said the total number of cases has climbed to 6,21,439.

Follow our full coverage of the coronavirus pandemic here.
PTI
first published: Dec 25, 2020 09:45 pm

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