New Delhi: Variation in genes encoding proteins involved in immune responses could be behind why some people remain asymptomatic following SARS-CoV-2 infection.
Human leukocyte antigen (HLA) genes encode these proteins used by the immune system in identifying and distinguishing healthy cells in the body from infected ones.
Research has shown at least 20 per cent of Covid-infected do not develop symptoms, or remain asymptomatic.
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