Christian Holm Hansen

Christian is a Statistician and epidemiologist in the department for infectious disease epidemiology and prevention at Statens Serum Institut (SSI) in Denmark and Associate Professor at the London School of Hygiene and Tropical Medicine (LSHTM) in the UK.

At the SSI, Christian’s work mostly focusses on COVID-19 epidemiology and in particular on population studies estimating the level and duration of COVID-19 vaccine protection, and protection after a previous infection against reinfection with SARS-CoV-2. Recently he has studied the protection after vaccination and previous omicron infection against infection and hospitalisation with new omicron subvariants. Through his appointment with LSHTM, Christian is also involved with research into non-communicable diseases and HIV epidemiology in sub-Saharan Africa.

Research interests: infectious disease epidemiology, clinical trials methodology, statistical modelling.

Selected recent publications

Hansen CH, Friis NU, Bager P, Stegger M, Fonager J et al. Risk of Reinfection, Vaccine Protection, and Severity of Infection with the BA.5 Omicron Subvariant: A Danish Nation-Wide Population-Based Study. 2022, Lancet Infect Dis 2023;23: 167–76. LINK

Gram MA, Emborg H-D, Schelde AB, Friis NU, Nielsen KF et al. Vaccine effectiveness against SARS-CoV-2 infection or COVID-19 hospitalization with the Alpha, Delta, or Omicron SARS-CoV-2 variant: A nationwide Danish cohort study. 2022, PLoS Medicine 19(9):e1003992 LINK

Michlmayr D, Hansen CH, Gubbels SM, Valentiner-Branth P, Bager P et al. Observed protection against SARS-CoV-2 reinfection following a primary infection: A Danish cohort study among unvaccinated using two years of nationwide PCR-test data. Lancet Regional Health Europe. 2022 Sep;20:100452. LINK

Fabian J, Kalyesubula R, Mkandawire J, Hansen CH, Nitsch D et al. Measurement of kidney function in Malawi, South Africa, and Uganda: a multicentre cohort study. 2022, Lancet Global Health; 10: e1159-e1169 LINK

Hansen CH, Michlmayr D, Gubbels SM, Mølbak K, Ethelberg S. Assessment of protection against reinfection with SARS-CoV-2 among 4 million PCR-tested individuals in Denmark in 2020: a population-level observational study. 2021, The Lancet, Vol.397 (10280), 1204-1212. LINK