Natural bacteriophages or phages are the most-abundant microorganisms in our environment and are present in high numbers in water and foods of various origins. Phages are bacteria-specific—each particular phage is specific for a particular bacterium and is unable to attach to other bacteria. They are harmless to humans, animals, and plants. Over countless millennia, humans have been routinely exposed to phages at high levels through food, water, and the environment, without adverse effect. In ce…