The coronavirus has given rise to a flood of conspiracy theories, disinformation and propaganda, eroding public trust and undermining health officials in ways that could elongate and even outlast the pandemic.

Claims that the virus is a foreign bioweapon, a partisan invention or part of a plot to re-engineer the population have replaced a mindless virus with more familiar, comprehensible villains. Each claim seems to give a senseless tragedy some degree of meaning, however dark.

Rumors of secret cures — diluted bleach, turning off your electronics, bananas — promise hope of protection from a threat that not even world leaders can escape.

The belief that one is privy to forbidden knowledge offers feelings of certainty and control amid a crisis that has turned the world upside down. And sharing that “knowledge” may give people something that is hard to come by after weeks of lockdowns and death: a sense of agency.