Dr. Benjamin Chan, an assistant research scientist in ecology and evolutionary biology at Yale University, holds a container with a growing sample, top left, of a bacteriophage from Dodge Pond in East Lyme in his lab in New Haven on Thursday, May 11, 2017.  The Dodge Pond phage recently was used to save the life of a New Haven ophthalmologist suffering from a severe antibiotic-resistant infection in his chest. (Sean D. Elliot/The Day)