Imagine waking up to the news that a deadly new strain of flu has emerged in your city. Health officials are downplaying it, but social media is flooded with contradictory claims from “medical experts” debating its origin and severity. Hospitals are filled with patients showing flu-like symptoms, preventing other patients from accessing care and ultimately leading to deaths. It gradually emerges that a foreign adversary orchestrated this panic by planting false information—such as the s...