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BackEntry title:

Acute respiratory infections daily number of emergency department attendances 7 day moving average

Last updated on Thursday, 6 March 2025 at 04:12pm

Summary

Topic
acute-respiratory-infection
Category
syndromic
API name
acute-respiratory-infection_syndromic_emergencyDepartment_averageRolling7Day

Rationale

Monitoring trends in daily emergency department attendances can provide an early warning of human public health threats and provide detail to inform public health action. The 7-day moving average helps us identify any trends in the data, by smoothing day-to-day variation.

Definition

The metric shows the 7-day moving average of the daily number of attendances at emergency departments by people diagnosed with COVID-19-like presentations in emergency departments across England.

Methodology

The 7-day moving average is calculated by taking the average of the 3 days prior to, day of and the 3 days after, a given day. This metric is adjusted for highs and lows in the data that may arise from variation in daily activity caused by weekends and bank holidays.

Acute respiratory infections emergency department attendances are identified from the primary diagnosis of each attendance. Other diagnoses may be recorded but are not used to group syndromic surveillance health indicators. The diagnoses are based on signs or symptoms of an illness and may not have lab confirmation.

Some syndromic surveillance indicators are hierarchical. The acute respiratory infections indicator includes the following diagnoses:

  • COVID-19-like
  • acute bronchitis or bronchiolitis
  • influenza-like illness
  • other and non-specific acute respiratory infections

We receive an automated daily transfer of anonymised emergency department data from NHS England from the Emergency Care Data Set (ECDS). Not all emergency departments provide data daily, so data reported are restricted to include emergency department attendances where:

  • data relate to attendances at a type 01 emergency department (major emergency departments with full resuscitation facilities)
  • we received data on patients arriving at that emergency department on all 7 of the most recent 7 days reported on
  • we received data for the most recent 7 days reported on within 2 calendar days of patient arrival

When an emergency department meets these criteria, we include all historical data. Which emergency departments are included each week are likely to change. This change in emergency departments included week-to-week means that data published in different weeks cannot be combined to make a longer time series.

Caveats

The data presented are based on a national syndromic surveillance system. They should be used to monitor trends, not estimate numbers of 'cases' of a disease or condition.

The syndromic surveillance indicators group together diagnoses made based on signs or symptoms of an illness, there may not be lab confirmation of a diagnosis.

We do not identify individual emergency departments included in the syndromic surveillance data published each week.

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