First discovered in 1917, bacteriophages?or phages?are living medicines: viruses that devour bacteria. Ubiquitous in the environment, they are found in water, soil, inside plants and animals, and in the human body. When phages were first recognized as medicines, their promise seemed limitless. Grown by research scientists and physicians in France, the Soviet Union, and elsewhere to target specific bacteria, they cured cholera, dysentery, bubonic plague, and other deadly infectious diseases.
