If a narrative of any kind emerged from those lectures, it was the drama of the interaction between our immune system and the pathogens with which it coevolved. This drama was sometimes characterized as an ongoing battle, but not the kind that involves Apache helicopters and unmanned drones—this was clearly a battle of the wits. “And then the viruses got even smarter,” my professor would say, “and did something ingenious—they used our own strategies against us.” In his telling, our bodies and the viruses were two competing intelligences locked in a mortal game of chess.
