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BackEntry title:

FluSurvey participants by week

Last updated on Thursday, 12 November 2026 at 02:00pm

Summary

Topic
Influenza
Category
cases
API name
influenza_cases_surveyParticipantsByWeek

Rationale

The number of people taking part in FluSurvey can change over time.

This metric shows the number of participants contributing data each week. It provides important context when interpreting weekly influenza-like illness (ILI) rates.

Definition

The number of FluSurvey participants living in England who complete a symptoms survey during the reporting week.

Methodology

FluSurvey (https://flusurvey.net/) is an online survey used to monitor respiratory illness in the UK. Participants complete regular surveys about:

  • respiratory symptoms
  • social contacts
  • use of healthcare services

For national reporting, only surveys from participants living in England are included. The number of distinct participants who submitted a symptoms survey during each reporting week is counted. Each participant is counted once for each reporting week.

Caveats

FluSurvey participants may not be representative of the population of England.

Participation is voluntary. The number and characteristics of people completing the survey can change from week to week.

Changes in participant numbers can affect the interpretation of other FluSurvey metrics.