Scientists are most worried with these 3 strains in all the coronavirus variants

 There are several strains of coronavirus circulating around the world, but health authorities are mainly concerned with the appearance in the United Kingdom, South Africa and Brazil of three variants first observed. They appear to be spreading more quickly and testing is continuing to see how more severe diseases are caused.

When a virus infects humans, when it makes copies of itself, it will mutate. Some mutations, allowing it to die out, may be dangerous to a virus. Others will give an edge and help it spread.

Mary Petrone, who studies infectious diseases at Yale University, said, "Not every mutation is created equal." "Now and again, the virus is going to get lucky."

It is necessary to track variants because of the risk that they could make vaccines and therapies less successful or alter the way they infect individuals.

Early in the pandemic, a mutation fueled the spread of the virus across the world, but until recently, Ohio State University biologist Daniel Jones said, there had been no significant improvements since.

One of the three major forms found by experts was identified late last year in the United Kingdom and has since been detected in hundreds of countries. Initially, health authorities said that it did not appear to cause worse diseases, although some newer evidence shows that it may be unclear at the moment. It tends to spread more quickly, leading to more hospitalizations and deaths.

According to the Centers for Disease Control and Prevention, the variant could become prevalent in the U.S. by March.

Experts say that other forms first identified in South Africa and in Brazil also appear more infectious.

Evidence so far shows that existing vaccines can still protect against these types, although there is some doubt that their efficacy could be marginally decreased. There is some evidence that, against some variants, certain antibody therapies can be less successful.

In order to preserve their efficacy, there are options to change vaccines and therapies, said Dr. Anthony Fauci, the top U.S. authority on infectious diseases.

As infections give viruses the ability to mutate and propagate, the development of variants is related to continuous surges. It's another explanation why specialists highlight the value of wearing masks and social isolation.

Jones added, "The fewer humans carry the virus, the fewer opportunities it has to mutate."

Here's what the Centers for Disease Control and Prevention says about the three varieties of highest concern:

1-A new version of SARS-CoV-2 (known as 20I/501Y.V1, VOC 202012/01, or B.1.1.7) has appeared in the United Kingdom (UK), with a significant number of mutations. In many countries around the world, including the United States, this variant has also been identified (US). In January 2021, UK researchers reported evidence[1] indicating that the B.1.1.7 version could be associated with an elevated risk of death.

Close to other versions. To validate this result, further studies are needed. At the end of December 2020, this version was published in the US.

2-Another version of SARS-CoV-2 (known as 20H/501Y.V2 or B.1.351) has appeared in South Africa, independently of B.1.1.7. This version shares B.1.1.7 with certain mutations. Many countries outside of South Africa have detected cases linked to this variant. At the end of January 2021, this version was registered in the US.

3-A variant of SARS-CoV-2 (known as P.1) appeared in Brazil, which was first detected in four travelers from Brazil who were checked at Haneda airport outside Tokyo, Japan, during routine screening. This version has 17 unique mutations, including three in the spike protein's receptor binding domain. At the end of January 2021, this version was found in the US.

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