INTRODUCTION: As of 30 April 2020 , 203.715 SARS-CoV-2 infections had been reported in Spain , 54.486 in Madrid , 21.4% were health care workers . Our objective is to determine seroprevalence of COVID-19 among workers in a monographic pediatric hospital .
METHODS: Between April13th and 30th, 1.523 health workers were recruited to be tested for SARS-CoV-2 serology screening (All Test®) and they answered a questionnaire with demographic, epidemiological and clinical information and previous exposure to COVID-19 . FINDINGS: One thousand two hundred ninety two (84.8 %) were tested . Positive serology (IgM and/or IgG) to SARS-CoV-2 was found in 17.2% (222/1.292), in 15.5% (201/1.292) if only IgG was considered . Median age was 44±13 years , 73% were female . The 33.8% (75/222) were asymptomatic . Eighty one had a previous positive rRT-PCR . The 14% (32/222) referred a family contact .
CONCLUSION: Serology prevalence for SARS-CoV-2 in workers of a pediatric hospital was higher than in general population . Many of them had an unnoticed infection.