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In the middle of the second century AD, Rome was at its prosperous and powerful apex. The emperor Marcus Aurelius reigned over a vast territory that stretched from Britain to Egypt. The Roman-made peace, or Pax Romana, seemed to be permanent. Then, apparently out of nowhere, a sudden sickness struck the legions and laid waste to cities, including Rome itself. This fast-spreading disease, known now as the Antonine plague, may have been history’s first pandemic. Soon after its arrival, the Empire began its downward trajectory toward decline and fall.

Plagues upon the Earth is a monumental history of humans and their germs. Weaving together a grand narrative of global history with insights from cutting-edge genetics, Kyle Harper explains why humanity’s uniquely dangerous disease pool is rooted deep in our evolutionary past, and why its growth is accelerated by technological progress. He shows that the story of disease is entangled with the history of slavery, colonialism, and capitalism, and reveals the enduring effects of historical plagues all around us, in patterns of wealth, health, power, and inequality.