Attachment style and immunity: A 1-year longitudinal study

► Participants were followed up over a 1-year period with four assessment points. ► Study measures include stress, social support, alexithymia, attachment, immune assays. ► High attachment avoidance independently associated with reduced NK cell cytotoxicity. ► The findings corroborate previous cross-sectional studies. ► Attachment style as an individual difference factor to focus on in psychoimmunology.