Short-term effectiveness of the XBB.1.5 updated COVID-19 vaccine against hospitalisation in Denmark: a national cohort study

Affiliations

• ¹ Department of Infectious Disease Epidemiology and Prevention, Statens Serum Institut, Copenhagen, Artillerivej 5, 2300 Kbh S, Denmark; MRC International Statistics and Epidemiology Group, London School of Hygiene and Tropical Medicine, London, UK. Electronic address: choh@ssi.dk.
• ² Department of Infectious Disease Epidemiology and Prevention, Statens Serum Institut, Copenhagen, Artillerivej 5, 2300 Kbh S, Denmark.
• ³ Virus Research and Development Laboratory, Virus & Microbiological Special Diagnostics, Statens Serum Institut, Copenhagen, Denmark.
• ⁴ Division of Infectious Disease Preparedness, Statens Serum Institut, Copenhagen, Denmark.