Project COVERED is a prospective cohort study of 1600 health care personnel (HCP) working in US emergency departments (EDs) with the following primary objectives: 1. To estimate the attributable risk of occupational acquisition of COVID-19 infection for emergency physicians and nurses. 2. To estimate the attributable risk of occupational acquisition of COVID-19 infection related to emergency endotracheal intubation. 3. To identify patient-, provider-, facility-, and procedure-based risk factors associated with SARS-CoV-2 transmission during endotracheal intubation. 4. To determine the prevalence of symptomatic and symptomatic COVID-19 infections occurring in ED HCPs. These questions will be answered through public health surveillance of a cohort of HCPs by obtaining serial symptoms questionnaires, SARS-CoV-2 serology (IgG), and self-collected nasal swabs (PCR) over a 12-week surveillance period during the global COVID-19 pandemic of the following 4 study populations: 1. Emergency physicians likely to be performing endotracheal intubation 2. Emergency physicians unlikely to be performing endotracheal intubation 3. Emergency department nurses 4. Emergency department nonclinical staff unlikely to have patient contact These files contain the analytic data set for all participants enrolled in Project COVERED and their associated COVID-19 risk factor and test surveillance during 2020.