Tthe union Health Ministry, on May 28, said that the death toll due to COVID-19 had risen to 4,531 and the number of cases had climbed to 158,333 in the country, registering an increase of 194 deaths and 6,566 cases in the last 24 hours till 8 am.
The number of active COVID-19 cases stand at 86,110 while 67,691 people have recovered and one patient has migrated, it said.
"Thus, around 42.75 per cent patients have recovered so far," a senior Health Ministry official said.
The total confirmed cases include foreigners.
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.
Follow our full coverage of the coronavirus pandemic here.(With PTI inputs)