We measured serum SARS-CoV-2 antibodies in 215 children of healthcare workers to estimate secondary attack rates (SAR). Twenty-one families had a parent with confirmed COVID-19. There was strong evidence of family clustering (P<0.001): 20/21 (95.2%) children were seropositive in 9 families and none of 23 children in 12 other families.
Secondary attack rate and family clustering of SARS-CoV-2 infection in children of healthcare workers with confirmed COVID-19