Severity of maternal infection and perinatal outcomes during periods of SARS-CoV-2 wildtype, alpha, and delta variant dominance in the UK: prospective cohort study.
Nicola J VousdenRema RamakrishnanKathryn BunchEddie MorrisNigel A B SimpsonChristopher GalePatrick O'BrienMaria QuigleyPeter BrocklehurstJennifer J KurinczukMarian KnightPublished in: BMJ medicine (2022)
ISRCTN40092247.