“…SARS-CoV-2 antibody testing after the 4-week swabbing using the Abbott SARS-CoV-2 IgG assay 6 found two-thirds of residents and staff to be seropositive, 5 consistent with other care home investigations in London. 7 Since July 2020, the four London care homes have been participating in national screening for SARS-CoV-2, whereby swabs for residents and staff are ordered online and sent to one of several national testing centres. 4 Only qualitative results with no RT-PCR cycle threshold (Ct) values or other parameters are reported back to the care home.…”