SARS-CoV-2 infection rates of antibody-positive compared  with antibody-negative health-care workers in England:  a large, multicentre, prospective cohort study (SIREN) / 
Victoria Jane Hall [and twenty two others] 
<br/><br/><br/>Published Online April 9, 2021<br/>https://doi.org/10.1016/S0140-6736(21)00675-9 
<br/><br/><label>Subjects--Topical Terms: </label><br/>COVID-19<br/>Coronavirus Infections<br/>COVID-19 Serological Testing<br/>Health Personnel