Everything Is Tuberculosis: The History and Persistence of Our Deadliest Infection

by John Green

Today, we understand tuberculosis as an infection caused by bacteria. TB is airborne—it spreads from person to person through small particles contained in coughs, sneezes, or exhalations. Anyone can get tuberculosis—in fact, between one-quarter and one-third of all living humans have been infected with it. In most people, the infection will lie dormant for a lifetime. But up to 10 percent of the infected will eventually become sick, a phenomenon we call “active TB.” People are especially likely to develop active TB if they have a weakened immune system due to other health problems like diabetes, HIV infection, or malnutrition. In fact, of the ten million people who became sick with TB in 2023, over five million also experienced malnutrition. And because the disease spreads especially well in crowded living and working conditions like slums and poorly ventilated factories, tuberculosis has come to be seen as a disease of poverty, an illness that walks the trails of injustice and inequity that we blazed for it. The world we share is a product of all the worlds we used to share. For me at least, the history and present of tuberculosis reveal the folly and brilliance and cruelty and compassion of humans.