Identifying health behaviors associated with adverse events following immunization (AEFI) could identify intervention targets for AEFI prevention. University employees receiving an influenza vaccination (n = 1301) completed a series of online surveys for health behaviors including sleep, exercise, dietary intake, and smoking habits, and emotional state (baseline), and for indications of AEFI (three days post-vaccination) and influenza-like illness (ILI) symptoms (fortnightly follow-up for 4 months). 29.9% of participants reported an AEFI and 46.0% reported experiencing...