Table 5 Table describing definitions used to group individuals based on their swab (RT-PCR) or antibody test status and duration of symptoms, as logged in ZOE COVID Symptom Study app.
Group | For swab test | For antibody Test-If no appropriate swab available |
|---|---|---|
AsymptomaticCOVID-19 | Positive swab with no symptoms around test (14 days before to 7 days after inclusive), with logging at least every 7 days | Positive antibodies with no symptoms before test including in “past symptoms”, with logging at least every 7 days |
Acute COVID-19 illness (ACI) | Positive swab test with swab taken up to 7 days prior, or 14 days after onset of symptoms | Positive antibody test, with symptomatic symptoms lasting 7 days or less, starting > 14 days before testing |
Ongoing symptomatic COVID-19 (OSC28) | Positive swab, around onset of symptoms (as above). Symptoms lasting over 28 days up to 84 days | Positive antibody test, with symptoms lasting over 28 up to 84 days, starting > 14 days before testing |
Post COVID-19 syndrome (PCS84) | Positive swab test with symptoms lasting ≥ 84 days | Positive antibody test, with symptoms lasting ≥ 84 days starting > 14 days before testing |
Negative Non-COVID-19 illness 28–83 days (NC28) | Negative swab test in first 2 weeks of symptoms, and symptoms lasting 28 to 83 days inclusive. No other positive test during logging, including a negative antibody test at enrolment | Negative antibody test > 14 days after onset of symptoms, with symptoms lasting 28 to 83 days inclusive |
Negative Non-COVID-19 illness ≥ 84 days (NC84) | Negative swab test in first 2 weeks of symptoms, and symptoms lasting ≥ 84-days. No other positive test during logging, including a negative antibody test at enrolment | Negative antibody test > 14 days after onset of symptoms, with symptoms lasting ≥ 84 days |
