Breakthrough Infection by SARS-CoV-2 Delta and Omicron Variants Elicited Immune Response Comparable to mRNA Booster Vaccination.

Competing Interests: Potential conflicts of interest. All authors: No reported conflicts of interest. All authors have submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Conflicts that the editors consider relevant to the content of the manuscript have been disclosed.