Close contacts are those who have contact with suspected cases, confirmed cases, and positive monitors who meet one of the following conditions, but have not taken effective protection: 1. people who live, study, work, or otherwise have close contact with the case; 2. medical staff, family members, or other people who have similar close contact with the case for treatment, care, or visiting; 3. people who travel on the same transport with the case and have close contact Personnel, including those who have cared for the patient on the transport, fellow passengers of the patient, other passengers and crew members who are found to have close contact with the patient after investigation and assessment. Content source: Dr. You Lai