A matched cohort study of convalescent plasma therapy for COVID-19.

"CONFLICT OF INTEREST The authors have no disclaimer or conflict of interest to disclose."

"We thank all the healthcare providers who worked tirelessly to care for the patients enrolled in this study. We applaud the altruism of patients who donated convalescent plasma and acknowledge the hard work of blood bank staff at New York Blood Center, American Red Cross (Farmington, CT), and Nuvance Health Hospitals. We thank medical and surgical residents at Danbury Hospital and Vassar Brothers Medical Center who assisted with collecting data for the COVID‐19 registry. We are grateful for the assistance of Laura Morales, James Nitzkorski, Helene Rached, Stephanie Stroever, and Danbury Hospital internal medicine residency program with logistical issues related to this project. This study has not been registered with ClinicalTrials.gov due to the retrospective nature of study design. This study has been approved by the Biomedical Research Alliance of New York (BRANY). No patient consent was obtained given that it is a retrospective study."