Table 1.

Initial categorisation of cases by date of first positive SARS-CoV-2 PCR.

Group	Definition
Hospital onset, healthcare associated	Positive specimen date >14 days from admission
Hospital onset, suspected healthcare associated	Positive specimen date 8–14 days after admission or specimen date 3–14 days after admission, with prior admission in previous 14 days
Hospital onset, indeterminate healthcare associated	Positive specimen date 3–7 days after admission, with no prior hospital admission in previous 14 days
Community onset, suspected healthcare associated	Positive specimen date ≤2 days after admission, with prior hospital admission in previous 14 days (for detailed inclusion criteria see main text)

PCR, polymerase chain reaction.