Viruses have been a part of our lives for so long, in fact, that we are actually part virus: the human genome contains more DNA from viruses than our own genes.
Blood type is dictated by genes that determine which kinds of molecules, called oligosaccharides, are found on the surface of your red blood cells. Norovirus and a few other viruses use these oligosaccharides to grab onto and infect intestinal cells
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