Seroprevalence of SARS-CoV-2 in Emergency Department Healthcare Workers at Sírio-Libanês Hospital, Brazil

COVID-19 has spread rapidly worldwide. Information on its prevalence and factors associated with infection are important for protecting both professionals and patients in healthcare centers. This study evaluated the seroprevalence of antibodies against SARS-CoV-2 and its association with the degree of exposure and use of personal protective equipment by healthcare professionals dedicated to the treatment of patients with flu-like illnesses in the emergency room. The research team included an analysis of healthcare professionals who underwent enzyme-linked immunosorbent assay serological testing for SARS-CoV-2 between May 28 and June 26, 2020, in the emergency room of Sírio-Libanês Hospital in São Paulo, Brazil. Participants answered individual questionnaires on occupational information, medical health history, and factors associated with exposure to the novel coronavirus. The questionnaire variables were compared based on the serological results. Of the 164 study participants, 96 (58.54%) reported at least 1 flu-like symptom and 42 (25.61%) presented serology results that were compatible with SARS-CoV-2 infection. The asymptomatic declared group accounted for 62 participants; of these, 8 (12.90%) had positive serology results (neutralizing antibody and IgG) for SARS-CoV-2. Data analysis showed a positive correlation with duration of work, safety in wearing and reusing personal protective equipment, and presence of anosmia, and showed a negative relationship with duration of mask use. Our findings suggest that the perception of symptoms by healthcare professionals is not a good screening parameter for the diagnosis of an infectious disease with respiratory symptoms, such as COVID-19. The main influencing factor for the control of infection is the elaboration of workflows and safety protocols based on simple and clear rules as well as investments in team training.