Viral populations of SARS-CoV-2 detected in upper respiratory tract, placenta, amniotic fluid and umbilical cord blood from a transplacental transmission case in Barcelona, Spain

Comparison of the viral populations of SARS-CoV-2 detected in upper respiratory tract (URT), placenta, amniotic fluid and umbilical cord blood samples from a woman at the first stage of labour presenting respiratory symptoms compatible with COVID-19 admitted to our hospital.