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https://assets.publishing.service.gov.uk..._FINAL.pdf

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The thresholds, detailed below, can be used by settings as an indication for when to seek
public health advice if they are concerned.

For most education and childcare settings, whichever of these thresholds is reached first:

• 5 children, pupils, students or staff, who are likely to have mixed closely, test
positive for COVID-19 within a 10-day period; or
• 10% of children, pupils, students or staff who are likely to have mixed closely test
positive for COVID-19 within a 10-day period


For special schools, residential settings, and settings that operate with 20 or fewer
children, pupils, students and staff at any one time:
• 2 children, pupils, students and staff, who are likely to have mixed closely, test
positive for COVID-19 within a 10-day period