Seropositivity and risk factors for SARS-CoV-2 infection in staff working in care homes during the COVID-19 pandemic. Issue 4 (April 2021) - Rowland, Thomas A.J.; Whitaker, Heather; Jeffery-Smith, Anna; Lang, Nicola; Sendall, Kate; McLaren, Rob; Brown, Kevin E.; Ramsay, Mary; Ladhani, Shamez N.; Zambon, Maria