2022 Recent common human coronavirus infection protects against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection: A Veterans Affairs cohort study. Nathanael R. Fillmore, Raphael E. Szalat, Jennifer La, Westyn Branch-Elliman, Paul A. Monach, Vinh Nguyen, Mehmet K. Samur, Mary T. Brophy, Nhan V. Do, Nikhil C. Munshi PNAS119(46), e2213783119 U.S. Veterans and VA Data Retrospective Cohort Study Electronic Health Records COVID-19 Cox Proportional Hazards Model
