Data Collection
Outpatient medical records, laboratory findings and radiological
characteristics were reviewed by three obstetricians and gynecologists.
Demographic characteristics, clinical manifestations and diagnostics,
the results of the COVID-19-associated tests, laboratory findings,
treatment, and outcomes were extracted from electronic medical records.
Throat swab samples were collected by professional swab-sampling staff
members, and the NAT was performed using real-time reverse
transcription-polymerase chain reaction according to the manufacturer’s
protocol (DAAN Gene Co., Ltd. Of Sun Yat-sen University). The
serological SARS-CoV-2 test kits were performed according to the
manufacturer’s instructions (Tangshan Innovita Biological Technology
Co., Ltd., 2019-nCoV Ab Test (Colloidal Gold)).