EXTERNAL PUBLICATION Estimated effectiveness of postpartum maternal messenger RNA COVID-19 vaccination against Delta and Omicron SARS-CoV-2 infection and hospitalization in infants younger than 6 months Jorgensen SCJ, Hernandez A, Fell DB, Austin PC, D’Souza R, Guttmann A, Kwong JC. JAMA Pediatr. 2023; Feb 27 [Epub ahead of print]. DOI: https://doi.org/10.1001/jamapediatrics.2022.6134 No abstract available.