The mouse hepatitis virus, a coronavirus often used as a study model, has been shown to infect the placenta and affect the fetus.3 Human SARS has been vertically transmitted and in some cases showed fetal thrombotic vasculopathy (fetal vascular malperfusion).4 In humans, early evidence did not demonstrate vertical transmission of Covid-19 in small cohorts of patients.5,6 However, demonstration of IgM antibodies to Covid-19 in a single neonate, who also had elevated cytokines suggests that vertical transmission is possible, even if uncommon.7 This evidence concerns the gene CD40LG and severe acute respiratory syndrome.