Chinese intelligence hackers were intent on stealing coronavirus vaccine data, so they looked for what they believed would be an easy target. Instead of simply going after pharmaceutical companies, they conducted digital reconnaissance on the University of North Carolina and other schools doing cutting-edge research.

They were not the only spies at work. Russia’s premier intelligence service, the SVR, targeted vaccine research networks in the United States, Canada and Britain, espionage efforts that were first detected by a British spy agency monitoring international fiber optic cables.

Iran, too, has drastically stepped up its attempts to steal information about vaccine research, and the United States has increased its own efforts to track the espionage of its adversaries and shore up its defenses.