Previous reports have documented an association between ABO blood group and risk for infection with the severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2), the cause of the coronavirus disease 2019 (Covid‐19) pandemic.1–3 Associations between race/ethnicity and SARS‐CoV‐2 positivity have also been reported.4, 5 Here we describe the first large‐scale observational study investigating the associations between ABO group/Rh types with SARS‐CoV‐2 positivity, by major race/ethnicity. In this retrospective, observational study, test results from a national reference clinical laboratory were assessed to determine the influence of race/ethnicity on the associations of ABO/Rh with SARS‐CoV‐2 RNA positivity. Results from SARS‐CoV‐2 RNA nucleic acid amplification tests (NAAT) performed March through July 2020 were matched with ABO/Rh test results obtained for the same individual since January 2010. Only … Continue reading Association of ABO/Rh with SARS‐CoV‐2 positivity: The role of race and ethnicity in a female cohort