1. Secondary school/further education college 2. Willing and able to follow the study protocol 3. Willing and able to undertake PCR testing of contacts in the event the school is allocated to the control group 4. Commits to maintaining contact management in line with national standards 5. Willing and able to provide regular data of test results to Test and Trace and to allow members of an index case’s contact group to be flagged in a database. 6. Willing and able to support baseline data collection requirements (e.g., provision of school register, bubble allocation data, etc.) 7. Willing to communicate regularly to Participants via Participant Information Sheets and other communication materials 8. Willing and able to provide a dedicated DHSC-funded Research Assistant to support data collection Inclusion criteria for DCT (in the intervention arm): Staff (including temporary or contract staff) and students in secondary schools/further education colleges/year 7 and above in all-through schools’ individuals, who are: 1. Contact of a positive case related to school 2. Asymptomatic 3. Onsite i.e. not self-isolating or shielding 4. Contact of an index case in the school’s population i.e. a staff member or student who has tested positive

1. Secondary school/further education college 2. Willing and able to follow the study protocol 3. Willing and able to undertake PCR testing of contacts in the event the school is allocated to the control group 4. Commits to maintaining contact management in line with national standards 5. Willing and able to provide regular data of test results to Test and Trace and to allow members of an index case’s contact group to be flagged in a database. 6. Willing and able to support baseline data collection requirements (e.g., provision of school register, bubble allocation data, etc.) 7. Willing to communicate regularly to Participants via Participant Information Sheets and other communication materials 8. Willing and able to provide a dedicated DHSC-funded Research Assistant to support data collection Inclusion criteria for DCT (in the intervention arm): Staff (including temporary or contract staff) and students in secondary schools/further education colleges/year 7 and above in all-through schools’ individuals, who are: 1. Contact of a positive case related to school 2. Asymptomatic 3. Onsite i.e. not self-isolating or shielding 4. Contact of an index case in the school’s population i.e. a staff member or student who has tested positive