Vivaldi 2: coronavirus (COVID-19) reinfections in care homes study report

Analysis (n=2,111) found in those with evidence of previous Covid-19 infection (confirmed by antibody testing), risk of reinfection was 61% lower for staff and 85% lower for residents, suggesting natural immunity substantially reduces risk of reinfection (<1% per month)

SPS commentary:

The analysis only explored natural immunity; participants were removed from the analysis 12 days following their first vaccine dose. The number of reinfections in this cohort was very low (4 residents, 10 staff).

Department of Health and Social Care