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China's new coronavirus infections double due to imported cases

China had 78 new cases on Monday, the National Health Commission said, a two-fold increase from Sunday. Of the new cases, 74 were imported infections, up from 39 imported cases a day earlier.

March 24, 2020 / 09:05 IST
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Mainland China saw a doubling in new coronavirus cases driven by a jump in infected travellers returning home from overseas, raising the risk of transmissions in Chinese cities and provinces that had seen no new infections in recent days.

China had 78 new cases on Monday, the National Health Commission said, a two-fold increase from Sunday. Of the new cases, 74 were imported infections, up from 39 imported cases a day earlier.

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The Chinese capital was the hardest-hit, with a record 31 new imported cases, followed by southern Guangdong province with 14 and the financial hub of Shanghai with nine. The total number of imported cases in China stood at 427 as of Monday.

Beijing has imposed tough screening and quarantine protocols, and has diverted all incoming international flights to other Chinese cities, but that has not stemmed the influx of Chinese nationals, many of whom are students returning home from virus-hit countries.

COVID-19 Vaccine
Frequently Asked Questions

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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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