[영문]BACKGROUND:: The impact of disasters on primary healthcare utilization is largely unknown. Moreover, it is often overlooked how disaster affects those closest to the primary victims, their family members. OBJECTIVE:: The objective of this study was to examine the long-term effects of a catastrophic fire on primary healthcare utilization. RESEARCH DESIGN:: We conducted a prospective, population-based cohort study covering 1 year pre- and 3 years postfire. Utilization data were extracted from primary care records. SUBJECTS:: Subjects consisted of 286 disaster victims, 802 family members of disaster victims, 3722 community control subjects, and 10,230 patients from a national reference population. MEASURES:: As outcome measures, we studied 1) the annual number of contacts in primary care and 2) the annual number of contacts for problems related to mental health. Determinants are injury characteristics of victims and bereavement. All analyses control for age, gender, and insurance status. RESULTS:: Being an uninjured victim who witnessed the disaster increases the number of contacts by a factor of 1.55 during the first year postfire (95% confidence interval [CI], 1.35?1.78). Uninjured victims contact the family practitioner more often for mental health-related problems than adolescent community control subjects (incidence rate ratio [IRR], 4.54; 95% CI, 1.69?12.20). In adult family members, the loss of a child predicts overall utilization (IRR, 1.88; 95% CI, 1.35?2.63) and utilization for mental health (IRR, 8.69; 95% CI, 2.10?35.92) during the first year postfire. CONCLUSION:: Attention should be paid to the primary care needs of bereaved individuals and those who have witnessed the disaster.