Study offers insights into how COVID variants escape immune system ‘killers’

Omicron subvariants of SARS-CoV-2—the virus behind COVID-19—have shown an uncanny knack for evading antibodies produced either by vaccines or exposure to earlier versions of the virus, leading to many breakthrough infections. However, in order to sicken people, these viral variants must also avoid “killer” T cells, immune cells that are unleashed when the immune system detects foreign pathogens.

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