Blood group and Covid19 – Hormone Therapy Explained

Blood groups A and B are Covid19 risk factors

2021-05-13, from “Blood Reviews“, https://www.sciencedirect.com/science/article/pii/S0268960X20301351: “Systematic review and meta-analysis indicated that blood groups A and B may be risk factors for COVID-19, whereas the blood group O appears to be protective.”