Table 2. Positive tests and total number of SARS-CoV-2 tests performed in each screening arm categorised according to week since starting the healthcare worker testing programme (6th April-24th May 2020).
In our original study between 6th to 24th April 2020, we described in detail two clusters of HCW infections.1 From 25th April 2020 to 24th May 2020, we detected one additional cluster on a general medical ward with a separated area for patients with proven COVID-19 and another for those without. This was identified through targeted screening of the ward over a 24-hour period from 4th to 5th May 2020, in response to four staff testing positive through the HCW symptomatic arm of the screening programme from 27th to 30th April 2020. Reactive screening of a further 40 staff from the same ward identified a further three positive asymptomatic HCWs. In addition, a further two HCWs tested positive in an asymptomatic screen of 30 individuals from a closely related clinical area (designated for non-COVID patients) on 6th May 2020.