Marthe Fourcade And Michelle Fay Cortez Bloomberg

An unsung arm of the immune system appears to protect against severe disease with the omicron variant even when antibodies wane, helping to explain why a record wave of infections hasn't engulfed hospitals so far.

An unsung arm of the immune system appears to protect against severe disease with the omicron variant even when antibodies wane, helping to explain why a record wave of infections hasn't engulfed hospitals so far.