Altogether 21 close contacts were identified of whom we could reach 17. Fourteen were still in Finland and placed in quarantine for 14 days. Information about three close contacts that had left the country was communicated to the competent authorities in their respective countries. For the remaining four close contacts, we had no contact details. Two of the 21 close contacts were closely co-exposed and therefore sampled on Days 4, 10, 12 and 14 after the first symptoms of the index case. Follow-up of all contacts ended on 11 February without secondary transmission events.