• Dani Dumitriu, Ukachi N Emeruwa, Erin Hanft, Grace V Liao, Elizabeth Ludwig, Lauren Walzer, Brittany Arditi, Minna Saslaw, Maria Andrikopoulou, Tessa Scripps, Caitlin Baptiste, Adrita Khan, Noelle Breslin, David Rubenstein, Lynn L Simpson, Margaret H Kyle, Alexander M Friedman, Daniel S Hirsch, Russell S Miller, Cristina R Fernández, Karin M Fuchs, M Kathleen Keown, Melissa E Glassman, Ashley Stephens, Archana Gupta, Sally Sultan, Caroline Sibblies, Susan Whittier, Wanda Abreu, Francis Akita, Anna Penn, Mary E D'Alton, Jordan S Orange, Dena Goffman, Lisa Saiman, Melissa S Stockwell, and Cynthia Gyamfi-Bannerman.
• Division of Child and Adolescent Health, Department of Pediatrics, Columbia University Irving Medical Center, New York, New York.
• JAMA Pediatr. 2021 Feb 1; 175 (2): 157-167.

ImportanceLimited data on vertical and perinatal transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and health outcomes of neonates born to mothers with symptomatic or asymptomatic coronavirus disease 2019 (COVID-19) are available. Studies are needed to inform evidence-based infection prevention and control (IP&C) policies.ObjectiveTo describe the outcomes of neonates born to mothers with perinatal SARS-CoV-2 infection and the IP&C practices associated with these outcomes.Design, Setting, And ParticipantsThis retrospective cohort analysis reviewed the medical records for maternal and newborn data for all 101 neonates born to 100 mothers positive for or with suspected SARS-CoV-2 infection from March 13 to April 24, 2020. Testing for SARS-CoV-2 was performed using Cobas (Roche Diagnostics) or Xpert Xpress (Cepheid) assays. Newborns were admitted to well-baby nurseries (WBNs) (82 infants) and neonatal intensive care units (NICUs) (19 infants) in 2 affiliate hospitals at a large academic medical center in New York, New York. Newborns from the WBNs roomed-in with their mothers, who were required to wear masks. Direct breastfeeding after appropriate hygiene was encouraged.ExposuresPerinatal exposure to maternal asymptomatic/mild vs severe/critical COVID-19.Main Outcomes And MeasuresThe primary outcome was newborn SARS-CoV-2 testing results. Maternal COVID-19 status was classified as asymptomatic/mildly symptomatic vs severe/critical. Newborn characteristics and clinical courses were compared across maternal COVID-19 severity.ResultsIn total, 141 tests were obtained from 101 newborns (54 girls [53.5%]) on 0 to 25 days of life (DOL-0 to DOL-25) (median, DOL-1; interquartile range [IQR], DOL-1 to DOL-3). Two newborns had indeterminate test results, indicative of low viral load (2.0%; 95% CI, 0.2%-7.0%); 1 newborn never underwent retesting but remained well on follow-up, and the other had negative results on retesting. Maternal severe/critical COVID-19 was associated with newborns born approximately 1 week earlier (median gestational age, 37.9 [IQR, 37.1-38.4] vs 39.1 [IQR, 38.3-40.2] weeks; P = .02) and at increased risk of requiring phototherapy (3 of 10 [30.0%] vs 6 of 91 [7.0%]; P = .04) compared with newborns of mothers with asymptomatic/mild COVID-19. Fifty-five newborns were followed up in a new COVID-19 Newborn Follow-up Clinic at DOL-3 to DOL-10 and remained well. Twenty of these newborns plus 3 newborns followed up elsewhere had 32 nonroutine encounters documented at DOL-3 to DOL-25, and none had evidence of SARS-CoV-2 infection, including 6 with negative retesting results.Conclusions And RelevanceNo clinical evidence of vertical transmission was identified in 101 newborns of mothers positive for or with suspected SARS-CoV-2 infection, despite most newborns rooming-in and direct breastfeeding practices.

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