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Norovirus Outbreak Reporting Tool

Norovirus is a frequent cause of outbreaks of gastroenteritis in NHS hospitals. Reporting outbreaks through this online surveillance tool will provide:

  -a timely quantification of the level of norovirus activity in NHS hospitals throughout the year
  -improved understanding of the overall burden of disease and impact on hospital resources
  -help in the detecting the emergence of new epidemic norovirus variants

Please see HNORS User Guidance which explains how to access the HNORS website and report an outbreak.

Please report all suspected and laboratory confirmed outbreaks (Definition of an outbreak) on a regular basis, weekly reporting is recommended.

Importance of reporting suspected and confirmed outbreaks

For national norovirus surveillance to be effective it is essential that all outbreaks of suspected or confirmed norovirus in NHS hospitals are reported to HNORS and NHS laboratories refer representative proportions of positive norovirus samples from these outbreaks to the national reference laboratory ( Enteric Virus Unit , PHE Colindale) on a regular basis.

Impact of COVID-19 pandemic on testing and reporting of norovirus cases

While the emergence of COVID-19 has caused significant disruption to testing and reporting of suspected norovirus cases outbreaks are still occurring in hospitals and care homes. Trends should be interpreted with caution due to current national advice and guidance regarding access to health care services during the COVID-19 pandemic

Therefore, it is more important than ever that suspected and confirmed outbreaks of norovirus in hospitals are reported to PHE via HNORS this winter.

Seasonal comparison of norovirus laboratory reports- 2020/21 and 2021/22 seasons compared to 5 season average (Source: SGSS)

Graph interpretation: Red bars: Number of norovirus laboratory repots per week recorded by the national laboratory surveillance system, Blue line: Average number of norovirus laboratory reports for the same period in the previous 5 seasons, Grey area: 95% confidence interval, expected variation around the mean over the previous 5 seasons

Surveillance reports and guidance

Publication of the Official Statistic “National norovirus and rotavirus report” is currently suspended due to the impact of the COVID-19 pandemic. For historical information on norovirus activity please see the ‘Epidemiology and surveillance’ section of the PHE Norovirus webpages. Please also see the Guidelines for the management of norovirus outbreaks in acute and community health and social care settings.

If you have any issues logging in, reporting outbreaks or would like to make a suggestion please contact the national norovirus surveillance team by emailing