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Weekly Influenza and Acute Respiratory Infection Report

Current level of influenza activity: Low
Trend: Decreasing
News: Influenza circulation is now returning to low levels. COVID-19 cases have increased since week 16. Additionally, detections of Mycoplasma pneumoniae remain elevated and recent weeks have seen increases in adenovirus and RSV.

For the latest annual influenza and acute respiratory infections in Wales reports see: Annual influenza surveillance and influenza vaccination uptake reports

Weekly surveillance reports

Latest report: Public Health Wales Influenza Surveillance Report: Week 20 2024 

Latest vaccination coverage data: Public Health Wales Influenza Vaccination Coverage Downloadable Data


Key points


In Wales:

Flu activity surveillance update

  • The GP consultation rate for influenza in Wales during week 20 reported through the GP Sentinel Surveillance of Infections Scheme was 3.3 consultations per 100,000 practice population.
  • The rate increased compared to week 19 (2.7 consultations per 100,000).

Virological surveillance update 

  • 29 surveillance samples from patients with ILI symptoms collected by sentinel GPs and community pharmacies during Week 20.  Of the 29 samples, two tested positive for influenza A (two for influenza A(H3N2)), six Rhinovirus, five mycoplasma and one positive of adenovirus, parainfluenza, bocavirus and SARS´┐ŻCoV-2 as at 22/05/2024.
  • During week 20, 1,324 hospital and non-sentinel GP patient samples underwent full respiratory screen multiplex testing by Public Health Wales Microbiology, of which, 21 were positive for influenza. A number of other causes of acute respiratory infection were identified (see full report). These tests are usually prioritised for symptomatic patients in hospitals, or less commonly community settings.
  • Confirmed RSV case incidence in children aged under 5 remained at baseline intensity levels.

Hospitalisations in confirmed cases of influenza and RSV

  • The 7-day rolling sums of cases hospitalised within 28 days of an influenza or RSV positive test result in the community (or up to two days post-admission) were six and five respectively during Week 19, and 38 for SARS-CoV-2 during week 19 (latest data available).
  • For further information see the Public Health Wales Dashboard on hospital admissions in ARI cases


In the UK and Europe
World Overview
  • The WHO reported on 15/05/2024, based on data up to 05/05/2024 that influenza activity continues to decrease in the northern hemisphere and elevated activity was reported in the southern hemisphere.
  • In the Northern hemisphere elevated activity is being reported in Central America and the Caribbean, due to influenza A viruses, and in Eastern Europe and Western Asia primarily due to influenza B viruses.
  • In the Southern hemisphere elevated influenza activity with mainly influenza A viruses was reported in South America. Some countries in Southern Africa reported elevated and increasing activity from prior weeks with influenza A detected.
  • See full WHO influenza update
MERS-CoV and H7N9 Updates
  • WHO was notified of three new MERS cases between 10 and 17 April 2024 by the Ministry of Health of the Kingdom of Saudi Arabia.
  • The latest WHO Influenza at Human-Animal Interface summary (08/04/2022 to 13/05/2022) reports that there have been no publicly available records from China or other countries on avian influenza A(H7N9) in recent months. Since February 2013, a total of 1,568 laboratory-confirmed cases of human infection with avian influenza A(H7N9), including at least 616 deaths, have been reported.
  • Updates are available from WHO Global Alert and Response
  • Latest WHO Influenza Monthly Risk Assessment Summary
  • Public Health Wales has published advice to health professionals which is available at MERS-CoV and Influenza H7N9 infection control preparedness

Weekly Influenza Surveillance Reports for Wales

Reports Archive