In a small study of party-goers who fell ill with COVID-19 after the party, 98% were vaccinated, Science Norway reports.
The party-goers attended an event that lasted several hours and involved riding a bus from the venue to a restaurant. While it was a private party, attendees were in several public venues and events before and after dinner.
An investigation into the outbreak revealed that 98% were fully vaccinated 79 days before the party. All had a negative PCR test within two days of the party.