UKOSS update

(cid:1) Initial studies of omicron infection in adult populations (who not were not pregnant) indicated a lower risk of severe pulmonary disease with this variant than with the previous delta variant of concern. It was unclear whether this was also the case for pregnant women, and whether prior vaccination had an impact on disease severity. The objective of this study was to use the UK obstetric surveillance system (UKOSS) to describe the characteristics of pregnant women admitted to hospital with SARS-CoV-2 infection including their vaccination status, severity of infection, pharmacological management, and pregnancy and perinatal outcomes, in the period when the omicron variant of concern was first dominant in the UK.