Types of Covid 19 variants and it’s causes
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Answer:
What Is a COVID-19 Variant?
Viruses are always changing, and that can cause a new variant, or strain, of a virus to form. A variant usually doesn't affect how the virus works. But sometimes they make it act in different ways.
Scientists around the world are tracking changes in the virus that causes COVID-19. Their research is helping experts understand whether certain COVID-19 variants spread faster than others, how they might affect your health, and how effective different vaccines might be against them.
How Many Coronaviruses Are There?
Coronaviruses didn't just pop up recently. They're a large family of viruses that have been around for a long time. Many of them can cause a variety of illnesses, from a mild cough to severe respiratory illnesses.
The new (or “novel”) coronavirus that causes COVID-19 is one of several known to infect humans. It's probably been around for some time in animals. Sometimes, a virus in animals crosses over into people. That's what scientists think happened here. So this virus isn't new to the world, but it is new to humans. When scientists found out that it was making people sick in 2019, they named it as a novel coronavirus. Experts call these strains SARS-CoV-2.
Answer:
Johns Hopkins Medicine
Mutations in viruses — including the coronavirus causing the COVID-19 pandemic — are ... as the most contagious form of the SARS-CoV-2 coronavirus so far.