Increased transmissibility of the B.1.1.7 SARS-CoV-2 variant: Evidence from contact tracing data in Oslo, January to February 2021

  1. Jonas Christoffer Lindstrøm
  2. Solveig Engebretsen
  3. Anja Bråthen Kristoffersen
  4. Gunnar Øyvind Isaksson Rø
  5. Alfonso Diz-Lois Palomares
  6. Kenth Engø-Monsen
  7. Elisabeth Henie Madslien
  8. Frode Forland
  9. Karin Maria Nygård
  10. Frode Hagen
  11. Gunnar Gantzel
  12. Ottar Wiklund
  13. Arnoldo Frigessi
  14. Birgitte Freiesleben de Blasio
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Abstract

We use data from contact tracing in Oslo, Norway, to estimate the new SARS-CoV-2 B.1.1.7 lineage’s relative transmissibility. Within households, we find an increase in the secondary attack rate by 60% (20% 114%) compared to other variants. In general, we find a significant increase in the estimated reproduction number of 24% (95% CI 0% - 52%), or an absolute increase of 0.19 compared to other variants.

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