This article, demonstrates that Rh negative blood group is protective againsT COVID-19 infection compared to the Rh positive blood group
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Arac, Eref, Solmaz, Hasan Akkoc, et al. “Association Between the Rh Blood Group and the Covid-19 Susceptibility." International Journal of Hematology and Oncology 30, no. 2 (2020): 181-86. doi: https://doi.org/10.4999/uhod.204247A