A negative test result does not guarantee that an individual will not later be required to self-quarantine if they have been exposed to infection, e.g. on the flight to Iceland. The contact tracing team interviews those who have been in close contact with a confirmed active case during two days prior to the onset of symptoms , e.g. been within 2 meters of an individual for morę than 15 minutes, or those who have sat beside an infected individual on an airplane. They might be required to self-quarantine for two weeks from the time of last contact.
The following applies if the individual was wearing a face mask (medical mask) and adhered to guidelines regarding hygiene and infection control as recommended. If those conditions are not met then the situation is evaluated and who needs to be quarantine possibly expanded.
Contact tracing is done for passengers within the 2 rows around a SARS-CoV-2 positively tested case. Contact tracing is performed in generał from 24 hours before his/her symptoms started (from 24 hours before diagnostic testing if asymptomatic). Ali these passengers should be informed about the exposure. Only passengers sitting directly next to the index patient will be defined as close contacts (high risk exposure). If the index patient sat on the aisle, the person sitting on the other side of the aisle will not be categorized as close contact (unless there is another indication, such as a travel partner/family, direct touch, coughed orsneezed on).
As a result, in most events, there will be 1 -2 close contacts, all other persons would be contact persons with a lower risk of infection (Iow risk of exposure).