According to Emergency Infectious Disease Work Team 6th meeting announce “NCHU Risk Levels and Corresponding” considering college is special high density place, no matter close contacts ever had 3 times vaccine or not, still need to follow the control measures, 7 days can’t enter school, so dormitory residents be confirmed as close contacts, and follow “NCHU dormitory C0VID-19 dormitory residents confirmed case and close contacts deal process” Back to home and quarantine at home(3+4) or self-initiated Epidemic Prevention (0+7) after 7 days than back dorm.