New York City Mice Found to Have Antibiotic Resistant Genes The study published in the journal mBio looked at gut samples from some 416 mice mostly taken from New York City residential buildings. Researchers found that six of the mice carried genes for antibiotic resistance, meaning antibacterial drugs would be ineffective in treatment. Dr. Ian Lipkin, lead researcher Dr. Ian Lipkin, lead researcher Nearly 40 percent of the mice carried disease-causing bacteria, including E. coli, Salmonella and Klebsiella pneumonia. After working with the CDC, the researchers linked certain bacteria they isolated with recent outbreaks of disease.