Around the world, harmful bacteria are gaining resistance to our most common antibiotics. However, a type of viruses called bacteriophages may provide a solution. In this video, NIAID experts Shayla Hesse, M.D., a Clinical Infectious Diseases Fellow at NIAID, and Randall Kincaid, Ph.D., a Senior Scientific Officer in the Concept Acceleration Program of NIAID's Division of Microbiology and Infectious Diseases, explain how these "phages" function, and how NIAID is supporting new phage research.