IFNL3 and infection: To evaluate whether IFN‐λ3 plasma levels and reduced NKG2A correlated with function of NK cells at different stages of infection, we monitored longitudinal changes in the cytotoxic potential of NK cells by analyzing the expression of CD107a, a degranulation marker and a surrogate marker of cytotoxicity 35, and IFN‐γ production in response to the NK cell target K562 cell line.