medRxiv preprint doi: https://doi.org/10.1101/2021.01.04.21249195; this version posted January 5, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license . 1 The incidence, characteristics and outcomes of pregnant women hospitalized with symptomatic and 2 asymptomatic SARS-CoV-2 infection in the UK from March to September 2020: a national cohort 3 study using the UK Obstetric Surveillance System (UKOSS) 4 5 Covid-19 in pregnancy 6 7 Nicola Vousden1,2 PhD, Kathryn Bunch MA1, Edward Morris MD3, Nigel Simpson MBChB4, Christopher 8 Gale PhD5, Patrick O’Brien MBBCh6, Maria Quigley MSc1, Peter Brocklehurst MSc7 9 Jennifer J Kurinczuk MD1, Marian Knight DPhil1 10 11 1National Perinatal Epidemiology Unit, Nuffield Department of Population Health, University of 12 Oxford, UK 13 2School of Population Health & Environmental Sciences, King’s College London, UK 14 3Royal College of Obstetricians and Gynaecologists, London, UK 15 4Department of Women's and Children's Health, School of Medicine, University of Leeds, UK 16 5Neonatal Medicine, School of Public Health, Faculty of Medicine, Imperial College London, London, 17 UK 18 6Institute for Women’s Health, University College London, London, UK 19 7Birmingham Clinical Trials Unit, Institute of Applied Health Research, University of Birmingham, UK 20 21 Corresponding author: 22 Marian Knight, National Perinatal Epidemiology Unit, Nuffield Department of Population Health, 23 University of Oxford, Old Rd Campus, Oxford, OX3 7LF, UK 24 Tel: 01865 289727 Email:
[email protected] 25 26 Non-standard abbreviations: 27 Royal College of Obstetricians and Gynaecologists - RCOG 28 NOTE: This preprint reports new research that has not been certified by peer review and should not be used to guide clinical practice.