Cohort 2 Asymptomatic Pregnant Women
Following identification of the SARS-CoV-2 positive women, we proceeded to assess the prevalence in a large scale study of asymptomatic women, initiated from the 4th May to 15thMay 2020. Eligible participants were identified from both inpatients and outpatient clinics. Patients were screened with a questionnaire for symptoms of SARS-CoV-2 at the time of the study and excluded if they had symptoms suggestive of active and or recent infection (recent 14 days). We approached 923 women and a total of 608 consented to and had a nasopharyngeal swab analysed. Five hundred and ninety-eight of these women consented to provide a blood sample for immunological analysis. Samples collected from participants were processed immediately and stored at -80°C prior to analysis.