Division of Birth Defects and Infant Disorders, National Center on Birth Defects and Developmental Disabilities, and the Division of Viral Hepatitis, National Center for HIV, Viral Hepatitis, STD and TB Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia; Eagle Global Scientific, LLC, San Antonio, Texas; the Tennessee Department of Health, Nashville, Tennessee; the Pennsylvania Department of Health, Pittsburgh, Pennsylvania; and the New York State Department of Health, Albany, and the New York City Department of Health and Mental Hygiene, New York, New York.

Corresponding author: Kate R. Woodworth, MD, MPH, Centers for Disease Control and Prevention, Atlanta, GA; email: [email protected].

This study was performed as regular work of the Centers for Disease Control and Prevention. This work is supported by the Epidemiology and Laboratory Capacity for Prevention and Control of Emerging Infectious Diseases Cooperative Agreement (CK19-1904) and contractual mechanisms. Staffing support (Ayzsa Tannis) for this work was funded by CDC to a contract to Eagle Global Scientific, LLC (contract number: 200-2019-06754).

Financial Disclosure The authors did not report any potential conflicts of interest.

The authors thank the following persons for their contributions to data-collection efforts for this project: Laura Price, Tennessee Department of Health; Cynthia Brooks, Chickasaw Nation Industries; Allison Longenberger, Pennsylvania Department of Health.

The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention. The Surveillance for Emerging Threats to Mothers and Babies Network does not collect information on sex or gender of the birthing individual. The terms “maternal” and “mother” are used throughout this publication to describe characteristics of people who are pregnant for clarity, but birthing individuals may be of any gender and may choose not to parent.

Peer reviews and author correspondence are available at https://links.lww.com/AOG/C904.

Presented at the Infectious Disease Society for Obstetrics and Gynecology conference, held virtually, July 29–31, 2021.

Each author has confirmed compliance with the journal's requirements for authorship.