Related Experiment Video
Updated: Oct 9, 2025

Author Spotlight: Advancements in Multiplex Detection of Respiratory Viruses
Published on: November 10, 2023
Outbreak caused by the SARS-CoV-2 Omicron variant in Norway, November to December 2021
Lin T Brandal1, Emily MacDonald1, Lamprini Veneti1
1Norwegian Institute of Public Health, Oslo, Norway.
Abstract:
In late November 2021, an outbreak of Omicron SARS-CoV-2 following a Christmas party with 117 attendees was detected in Oslo, Norway. We observed an attack rate of 74% and most cases developed symptoms. As at 13 December, none have been hospitalised. Most participants were 30-50 years old. Ninety-six percent of them were fully vaccinated. These findings corroborate reports that the Omicron variant may be more transmissible, and that vaccination may be less effective in preventing infection compared with Delta.
More Related Videos
Related Concept Videos
Steps in Outbreak Investigation
Single Nucleotide Polymorphisms-SNPs
Principles of Disease Surveillance
Viral Recombination
Infection
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
Viral Mutations

