At the Danish Microbiological Society (DMS) Congress in Copenhagen, Eleni Koursari, FEMS Science Communications Officer, interviews Martin J. Blaser (Professor and Henry Rutgers Chair of the Human Microbiome at Rutgers University, New Jersey; USA) to talk about the impact of antibiotics on the human microbiome before his keynote lecture: ''The Two-edged Sword of Antibiotics: Climate Change in Miniature''