Certain people who contract COVID never develop symptoms — and researchers may have finally figured out why.
avoid severe sickness, the researchers note. These"super dodgers" appear to have a mutation in the immune system-supporting human leukocyte antigen, allowing virus-killing cells to identify the coronavirus, according to the study. These virus-killing cells, called T cells, were able to find the coronavirus even if it was the first encounter due to a resemblance to already familiar seasonal cold viruses.
"If you have an army that's able to recognize the enemy early, that's a huge advantage," Dr. Jill Hollenbach, the study's lead researcher, a professor of neurology, epidemiology and biostatistics and a member of the Weill Institute for Neurosciences at UCSF, said in a."It's like having soldiers that are prepared for battle and already know what to look for, and that these are the bad guys.
Researchers found the mutation was carried by about 10% of the study's population and having two copies of the variant further increased protection from feeling sick by more than eight times. "It doesn't prevent the virus from infecting cells but, rather, prevents people from developing any symptoms. That includes a runny nose or even a barely noticeable sore throat," according to the release.
Understanding the biology behind asymptomatic infection has"important implications for public health measures, vaccine design and therapeutic development," the authors wrote.
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