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HomeNewscoronavirusCoronavirus pandemic | WHO warns of 'second peak' in areas where COVID-19 cases are declining

Coronavirus pandemic | WHO warns of 'second peak' in areas where COVID-19 cases are declining

Ryan said epidemics often come in waves, which means that outbreaks could come back later this year in places where the first wave has subsided.

May 26, 2020 / 18:11 IST
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Countries, where novel coronavirus infections are declining, could still face an "immediate second peak" if they let up too soon on measures to halt the outbreak, the World Health Organization said.

"The world is still in the middle of the first wave of the coronavirus outbreak," WHO emergencies head Dr Mike Ryan told an online briefing, noting that while cases are declining in many countries they are still increasing in Central and South America, South Asia and Africa.

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Ryan said epidemics often come in waves, which means that outbreaks could come back later this year in places where the first wave has subsided. There was also a chance that infection rates could rise again more quickly if measures to halt the first wave were lifted too soon.

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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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