Official Statistics

National flu report summary: 14 November 2019 (week 46)

Updated 1 October 2020

1. Main points: data up to week 45, 2019

Data up to week 45 (ending 10 November 2019) shows:

• during week 45, all influenza activity indicators are below baseline
• the impact of flu on healthcare services is below baseline for hospitalisations and for ICU and HDU influenza admissions
• respiratory syncytial virus (RSV) is circulating in the <5 year olds in England

The full weekly flu report this summary is based on, accompanying spreadsheet of data and slideset are available from weekly national flu reports: 2019 to 2020 season.

2. Surveillance scheme summaries

2.1 Community

Data from outbreak surveillance shows:

• there have been 42 new acute respiratory outbreaks reported in the past 7 days
• 28 outbreaks were reported from care homes where 2 tested positive for influenza A(unknown subtype)
• 1 outbreak was reported from a hospital with no test results available
• 12 outbreaks were reported from schools with no test results available
• the remaining outbreak was reported from the Other settings category with no test results

2.2 Primary care

Data from primary care surveillance shows:

• the rate of influenza-like illness (ILI) was below baseline threshold level
• the overall weekly ILI GP consultation rate was 4.6 per 100,000 in week 45 compared to 4.5 per 100,000 registered population in the previous week in participating GP practices for England
• in the devolved administrations, ILI rates were below baseline threshold levels for Northern Ireland, Scotland and Wales

2.3 Secondary care

Data from secondary care surveillance shows:

• hospitalisation rate observed was below baseline impact levels, with a rate of 0.83 per 100,000 in week 45 compared to 0.57 per 100,000 trust catchment population in the previous week, for England (16 NHS Trusts)
• ICU and HDU admission rate observed was below baseline impact levels, with a rate of 0.02 per 100,000 in week 45 compared to 0.02 per 100,000 trust catchment population in the previous week, for England (132 out of 143 NHS Trusts)
• there were no influenza admissions reported from the 6 severe respiratory failure centres in the UK

2.4 All-cause mortality

Data from all-cause mortality surveillance shows:

• no statistically significant excess all-cause mortality by week of death was seen overall and by age group in England in week 45
• in the devolved administrations, no statistically significant excess all-cause mortality for all ages was observed in Wales and Northern Ireland in week 45, and for Scotland in week 43 2019

2.5 Microbiological surveillance

Data from microbiological surveillance shows:

• in primary care, 14 samples tested positive for influenza (2 influenza A(H1N1)pdm09, 10 influenza A(H3), one influenza A(unknown subtype) and one co-infection of influenza A(H3N2) and influenza B) through the UK GP sentinel swabbing schemes in week 45, with an overall positivity of 12.9%
• in secondary care influenza percent positivity was 3.7%, below baseline threshold levels
• a total of 48 detections were recorded through the DataMart scheme (2 influenza A(H1N1)pdm09, 23 influenza A(H3), 20 influenza A(not subtyped) and 3 influenza B), with an overall positivity of 2.7%

2.6 Vaccination

Data from the GP patient, healthcare worker and primary school-age children flu vaccine uptake programmes shows:

• up to week 45 2019, in 79.0% of GP practices in England, the provisional proportion of people who had received the 2019 to 2020 influenza vaccine in targeted groups was 26.7% in under 65 years in a clinical risk group, 30.0% in pregnant women and 61.5% in those aged 65 and over
• up to week 45 2019, in 78.9% of GP practices reporting for the childhood collection the provisional proportion vaccinated was 10.7% in 2 year olds and 10.6% in 3 year olds

3. International situation

• in the temperate zone of the northern hemisphere, influenza activity remained at inter-seasonal levels in most countries; however continued to increase across the countries of the Arabian Peninsula
• in the temperate zones of the southern hemisphere, influenza activity was low in most countries, with influenza B virus detections continuing to be reported by Chile.
• worldwide, seasonal influenza A viruses accounted for the majority of detections

4. Further information

See ‘seasonal influenza: guidance, data and analysis’ for further information on the symptoms, diagnosis, management, surveillance and epidemiology of seasonal influenza (flu).

See ‘sources of UK flu data: influenza surveillance in the UK’ for further information and guidance on the surveillance schemes we use to track seasonal influenza.