Bacteriophage are viruses that target bacteria. Though they emerged in the 1920s as treatments for infectious diseases, because of their high level of specificity, they fell out of favor with the advent of broad-spectrum antibiotics. BiomX is developing both natural and engineered phage cocktails designed to target and destroy harmful bacteria in chronic diseases, such as cystic fibrosis, inflammatory bowel disease, and atopic dermatitis. We spoke to Jonathan Solomon, CEO of BiomX, about the case for phage therapies, the company’s approach to creating a phage cocktail that could effectively target a population of patients, and why it's focusing on chronic diseases.