Research and analysis

Comparing methods used in the COVID-19 Infection Survey and NHS Test and Trace, England

The methods used in the coronavirus (COVID-19) Infection Survey and NHS Test and Trace in England and why the data cannot be directly compared.

Applies to England

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While comparisons have been made between these 2 data sources, they measure different aspects of the COVID-19 pandemic.

They are complementary data sources but drawing direct comparisons between these 2 data sources could result in misrepresenting the statistics and misunderstanding the current infection rate of the pandemic.

Updates to this page

Published 6 October 2020
Last updated 6 October 2020 + show all updates
  1. Updated with final document.

  2. First published.

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