Study registration: *
Publication Morgan JA, Obstet Gynecol, 2021
Funding: Not reported/unclear
Conflict of interest: no COI (Financial Disclosure: The authors did not report any potential conflicts of interest.)
Description of participants: Pregnant women in Louisiana, USA
Follow-up duration (months): *
|Variant description :
Variant name: Delta|
Evidence: Indirect evidence (prevalence of variant in the population: 50-100%)
The published report was used in data extraction and risk of bias assessment. Roughly 2% of control group were partially vaccinated. Vaccine types were: Pfizer 66%, Moderna 29%, and Janssen 5%.
The main concern is the potential for uncontrolled confounding. There is also a potential issue with measuring infection status as testing behaviour may be influenced by vaccination status.