Barron's By AFP - Agence France Presse July 19, 2023
People who have a particular genetic variant are twice as likely to never get sick when they contract Covid-19, researchers said on Wednesday, offering the first potential explanation for the lucky group dubbed the "super dodgers".
Those who have two copies of the variant are eight times more likely to never get any symptoms from Covid, according to the study in the journal Nature.
Previous research has suggested that at least 20 percent of the millions of Covid infections during the pandemic were asymptomatic.
To find out what could be behind these cases, researchers took advantage of a database of volunteer bone marrow donors in the United States.
The database included each person's type of human leukocyte antigen (HLA), which are molecules on the surface of most cells in the body.
The immune system uses HLA to see which cells belong in the body, and they are thought to play a key role in the response to viral infections.
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