Re-assessing the total burden of norovirus circulating in the United Kingdom population

John Harris, Miren Iturriza-Go'Mara, Sarah J. O'Brien

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


The second Infectious Intestinal Diseases study (IID2) estimated the incidence of norovirus in the UK at 47/1000 population (three million cases annually). Clinically significant norovirus was defined using a cycle threshold (ct) value of <30; a more stringent cut-off than used in diagnostic laboratories. The low infectious dose of norovirus means asymptomatic individuals potentially contribute to ongoing transmission. Using a less stringent but diagnostically relevant threshold increases the estimation of the population burden of norovirus infection by around 26% to 59/1000 person years (95% CI 52.32–64.98), equating to 3.7 million norovirus infections annually (3.3–4.1 million). With possible vaccines on the horizon for norovirus, having a good estimate of the total burden of norovirus infection, as well as symptomatic disease will be useful in helping to guide vaccination policy when candidate vaccines become available.

Original languageEnglish
Pages (from-to)853-855
Number of pages3
Issue number6
Publication statusPublished - 7 Feb 2017
Externally publishedYes


  • Calicivirus
  • Gastrointestinal infections
  • Infectious diseases
  • Norovirus


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