India saw a single day rise of 45,951 coronavirus infections taking the total tally of COVID-19 cases to 3,03,62,848, while daily fatalities remained below 1,000 for the third consecutive day, according to the Union Health Ministry data updated on Wednesday.
The death toll rose to 3,98,454 with 817 fresh fatalities, the lowest in 81 days.
According to the data published at 7 am, cumulatively 33.28 crore vaccine doses have been administered so far under the Nationwide Vaccination Drive.
The active cases further declined to 5,37,064 comprising 1.77 per cent of the total infections, while the national COVID-19 recovery rate has improved to 96.92 per cent, the data updated at 8 am showed.
(With PTI inputs)
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.