The process of blood transfusions, started in the late 19th century and perfected in the early 20th century, were a big advancement in modern medicine and the treatment of human health. Part of the improvements in this procedure was the discovery of the various blood types in humans, and how that affects how the immune system responds to and “accepts” blood transfusions. Recently, researchers from the University of British Columbia may have found a reliable way to use a bacterial enzyme from the human gut to convert any type of blood into type O – which is compatible with nearly everyone.

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