Blood types play a crucial role not only in ensuring safe blood transfusions but also in influencing various health risks. Numerous studies suggest that genetically determined blood types may increase susceptibility to both infectious and non-infectious diseases, including COVID-19, heart disease, and allergies.
Blood is categorized into four main types—A, B, AB, or O—based on the types of antigens present on the surface of red blood cells. Antigens are proteins found on red blood cells that trigger an immune response when encountering unfamiliar substances, such as certain bacteria, Dr. Douglas Eric Guggenheim, a physician at the Abramson Cancer Center at the University of Pennsylvania Hospital, explained in a 2020 Penn Medicine article.
