HomeNewsTrendsHealthAs COVID-19 infections inch up, experts blame dropping of masks

As COVID-19 infections inch up, experts blame dropping of masks

Delhi, Uttar Pradesh and Haryana are seeing an increase in daily cases and test positivity rates. Experts urge caution but say too early to talk about the fourth wave 

April 18, 2022 / 15:39 IST
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India recorded 8,148 new coronavirus cases in the week ending April 17, nearly 15 percent higher than the previous week’s count of 7,088, raising concerns about a possible fourth wave in the country.

In the week gone by, active infections in the country, too, rose nearly 5 percent. The trend is in sharp contrast to the swift decline in new cases and active infections that was being seen since the end of January.

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The increase is particularly noticeable in three states—Delhi and its neighbours Haryana and Uttar Pradesh. The national capital reported 517 new cases on April 17, the highest since February 20.

The test positivity rate—the percentage of positive results among all tests performed—for Delhi has also climbed to more than 4.61 percent after remaining well under 1 percent for several weeks.

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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