Skip to main content

ICU-HDU Influenza Surveillance

A national mandatory collection, the UK Severe Influenza Surveillance System (USISS) is operating to report the number of confirmed influenza cases admitted to Intensive Care Units (ICU) and High Dependency Units (HDU) and number of confirmed influenza deaths in ICU/HDU across England.

Frequency: weekly

Background to the collection

A confirmed case is defined as an individual with a laboratory confirmed influenza infection admitted to ICU/HDU. Prior to the 2009 influenza pandemic there was a recognised gap in surveillance of severe respiratory infection in the UK, in particular with regards to hospitalised cases of influenza.

A pilot surveillance scheme for severe influenza, the UK Severe Influenza Surveillance System (USISS), was initiated during the 2010/11 post-pandemic influenza season in order to monitor and estimate the impact of seasonal influenza on the population and to describe the epidemiology of severe disease.

The system was subsequently rolled out in the 2011/12 influenza season and has continued to operate since and is mandated for all NHS trusts.

The objectives of the collection are to:

  1. Monitor and estimate the impact of influenza (both seasonal and pandemic) on the population
  2. Describe the epidemiology of severe influenza (ICU admissions and deaths) in time, place and person
  3. Be able to rapidly identify and describe the epidemiological features of a novel influenza virus
  4. To monitor the impact of the introduction of the childhood influenza vaccination programme.

Launch and submission dates

Launch and submission dates 2019/2020
Week Period Submission start Submission end
Week commencing 30 September 2019

30 September 2019 to 6 October 2019

7 October 2019

9 October 2019

Week commencing 
7 October 2019

7 October 2019 to 13 October 2019

14 October 2019

16 October 2019

Week commencing 14 October 2019

14 October 2019 to 20 October 2019

21 October 2019

23 October 2019

Week commencing
21 October 2019

21 October 2019 to 27 October 2019

28 October 2019

30 October 2019

Week commencing
 28 October 2019

28 October 2019 to 3 November 2019

4 November 2019

6 November 2019

Week commencing
4 November 2019

4 November 2019 to 10 November 2019

11 November 2019

13 November 2019

Collection continues weekly until

Week Reporting period Submission start date Submission end date

Week commencing

11 May 2020

11 May 2020 to 17 May 2020  18 May 2020 20 May 2020 

All deadlines are 11am

All collections will remain open for 2 weeks following the deadline date for submission of amended data, if appropriate.

Guidance

Last edited: 2 October 2019 12:43 pm