As it turned out, the Florida Keys, already hit hard by the coronavirus, was in the middle of a dengue outbreak too. Heat rearranges the natural world and rewrites disease algorithms on our planet. It creates new opportunities for microbes, opening up fresh biological landscapes for them to explore, turning pathogens into microscopic versions of Ferdinand Magellan, expanding the boundaries of the known world. Heat waves, as well as heat-driven climate events like flooding and drought, have worsened more than half of the hundreds of known infectious diseases in people, including malaria,
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