Acknowledgement
The authors are grateful for the support from the NCKU Epidemic Prevention Scientific Research Center and Core Research Laboratory, College of Medicine, National Cheng Kung University. We also thank the technical services provided by the “Biosafety Level 3 Core Laboratory (MOST 111-2740-B006-003) of the National Core Facility for Biopharmaceuticals (MOST 111-2740-BA49-002), National Science and Technology Council, Taiwan. We would also like to express our gratitude to all the team members involved in the COVID-19 specialized maternity unit, including obstetricians, obstetric nurses, infectious disease physicians, and the Center for Infection Control of NCKUH.