Humans were likely the original source of Staphylococcus aureus, which jumped back and forth between people and livestock over thousands of years, leading to epidemic strains of the bacterium and facilitating its resistance to antibiotics, according to results from a genomic study published in Nature Ecology & Evolution.
J. Ross Fitzgerald, PhD, chair of molecular bacteriology at University of Edinburgh’s Roslin Institute, and colleagues called the ability of some pathogens to jump between host species “a major threat to public health and food security” and noted that S.

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