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Coronavirus pandemic | 36 new COVID-19 cases in Dharavi, tally rises to 1,675: BMC

As no new death was reported in Dharavi in the last 24 hours, the number of victims remained unchanged at 61, the official said.

May 28, 2020 / 09:01 PM IST

Representative Image (Image: BMC)


The count of COVID-19 cases in Dharavi, Mumbai's biggest slum, rose to 1,675 on Thursday as 36 more people tested positive for the infection, an official of the Brihanmumbai Municipal Corporation (BMC) said.

As no new death was reported in Dharavi in the last 24 hours, the number of victims remained unchanged at 61, the official said.

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Of the 36 new patients, five tested positive in a municipal chawl locality of the slum, he added.

Dharavi, considered as the largest slum sprawl of Asia, has a population of over 6.5 lakh living in an area spread over 2.5 square kilometres.

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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.

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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.

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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: May 28, 2020 07:45 pm

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