COVID-19/epidemiology; Fetus; Pregnancy Complications, Infectious/epidemiology; Pregnancy Complications, Infectious/virology; COVID-19/blood; COVID-19/immunology; COVID-19/mortality; China/epidemiology; Cohort Studies; Female; Fetal Blood/virology; Fetus/immunology; Fetus/virology; Hospitalization/statistics & numerical data; Humans; Infectious Disease Transmission, Vertical/statistics & numerical data; Patient Safety; Placenta/immunology; Placenta/pathology; Pregnancy; Pregnancy Complications, Infectious/mortality; Premature Birth; Prenatal Exposure Delayed Effects/virology; Registries; Risk Assessment; SARS-CoV-2/isolation & purification; Uncertainty; United Kingdom/epidemiology; Vaccination/adverse effects

Epidemiology; Infection; SARS-CoV-2