Quarantine times are longer for unvaccinated employees because those who are unvaccinated shed active virus longer than those who are vaccinated.
For vaccinated people, the average duration of viral shedding — or time they are infectious — is around five days (up to 6 1/2 days), so they can come back to work after being out for seven days. Because that duration is longer with unvaccinated people, they are restricted from work for the full 10-day isolation period in health-care settings due to the risks to other staff and to patients.