About this release

This release is a weekly report on epidemiological information on seasonal respiratory infection activity in Scotland. Due to the COVID-19 pandemic, health care services are functioning differently now compared to previous flu seasons so the consultation rates are not directly comparable to historical data.

Main points

Overall assessment:

  • The proportion of NHS24 calls for respiratory symptoms in week 23 was at Baseline activity level overall. The 5-14, 15-44, 45-64, 65-74 and over 75 age groups remained at Baseline activity level. The 1-4 age group remained at Low activity level. The under 1 age group increased from Low to Moderate activity level.
  • In week 23 there were 22 influenza cases: 17 type A (subtype unknown), three type A(H3) and two type B.
  • In week 23, adenovirus, coronavirus (non-SARS-CoV-2), HMPV, RSV, rhinovirus, Mycoplasma pneumoniae and Parainfluenza were at Baseline activity level.
  • The number of laboratory-confirmed RSV cases for week 23 is greater than what would be expected at this time of the year. The majority (79%) of RSV detections in week 23 were in those aged under 5 years and the majority (87%) of diagnoses across all age groups occurred in the hospital setting.
  • The hospitalisation rate for influenza was 0.2 per 100,000 in week 23, with the highest hospital admission rate for confirmed influenza noted in patients aged between 1 and 4 years (1.4 per 100,000). The highest hospitalisation rate for influenza this season was reported in week 11 (1.3 per 100,000).
  • The vaccination programme ended, as it does every year, on the 31st March. The final data presented here indicate that for season 2021/22 at least 2,706,968 eligible individuals are estimated to have received their flu vaccine.


Surveillance of respiratory infection is a key public health activity as it is associated with significant morbidity and mortality during the winter months, particularly in those at risk of complications of flu e.g. the elderly, those with chronic health problems and pregnant women.

The spectrum of respiratory illnesses vary from asymptomatic illness to mild/moderate symptoms to severe complications including death.

There is no single respiratory surveillance component that can describe the onset, severity and impact of influenza or the success of its control measures each season across a community.

This requires a number of complementary surveillance components which are either specific to respiratory infections or their control, or which are derived from data streams providing information of utility for other PHS specialities (corporate surveillance data). Together, the respiratory surveillance components provide a comprehensive and coherent picture on a timely basis throughout the flu season. Please see the influenza page on the HPS website (external website) for more details.

Further information

The next release of this publication will be 23 June 2022.

General enquiries

If you have an enquiry relating to this publication, please email phs.flu@phs.scot.

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If you have a media enquiry relating to this publication, please contact the Communications and Engagement team.

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To report any issues with a publication, please email phs.generalpublications@phs.scot.

Older versions of this publication

Versions of this publication released before 16 March 2020 may be found on the Data and Intelligence, Health Protection Scotland or Improving Health websites.

Last updated: 21 March 2024
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