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Delhi records 197 fresh coronavirus cases; positivity rate dips to 0.26%

The active cases tally on Saturday stood at 1,880, while the positivity rate dipped to 0.26 percent, according to the latest bulletin issued by the Delhi health department.

January 23, 2021 / 07:39 PM IST
Representative image

Representative image

Delhi recorded 197 fresh COVID-19 cases and 10 deaths on Saturday, even as the positivity rate slipped to 0.26 percent, authorities said. The city's infection tally is now over 6.33 lakh and the death toll 10,799, they said.

On Monday, the city had recorded 161 cases, the lowest in nearly nine months, with a positivity rate of 0.32 percent.

The active cases tally on Saturday stood at 1,880, while the positivity rate dipped to 0.26 percent, according to the latest bulletin issued by the Delhi health department.

Health Minister Satyendar Jain had earlier said that the low number of active cases in Delhi was "satisfactory".

This month, 585 cases were reported on January 1 and 494 on January 2; 424 on January 3; 384 on January 4, and 442 on January 5; 654 on January 6; 486 on January 7 and 444 on January 8; 519 on January 9 and 399 on January 10; 306 on January 11 and 386 on January 12 and 357 on January 13 and 340 on January 14.

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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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From January 15-22, the daily figures stood at 295; 299; 246; 161; 231; 228; 227 and 266 respectively.

These 197 new cases came out the 76,868 tests conducted the previous day, including 47,467 RT-PCR tests and 29,401 rapid antigen tests.

The bulletin said that the total number of cases has climbed to 6,33,739.

Follow our full coverage of the coronavirus pandemic here.
PTI
first published: Jan 23, 2021 07:38 pm

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