Mumbai on Friday reported 335 new coronavirus cases and six fresh deaths, taking the infection tally to 7,55,331 and the toll to 16,241, a civic official said.
On Thursday the city had reported 327 COVID-19 cases and 6 fatalities. The official said Mumbai is left with 4,131 active COVID-19 cases after 312 patients were discharged from hospitals during the day, taking the number of recovered cases to 7,32,426.
He said 39,083 COVID-19 tests were conducted in the last 24 hours, pushing their cumulative number to 1,13,83,092.
Presently, Mumbai has 37 sealed buildings, while it is free of containment zones in slums and 'chawls' (old row tenements) since mid-August, the official said.
According to the official, Mumbai's COVID-19 recovery rate is 97 per cent.
Frequently Asked Questions
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.
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.
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.