Aubrey Cunnington, PhD, BMBCh, Reader in Pediatric Infectious Disease and Honorary Consultant in Pediatric Diseases at St Mary’s Hospital, Imperial College Healthcare NHS Trust, London, UK, discusses emerging infectious diseases, including the definition, types of infection, and drivers of emergence. Dr Cunnington also discusses recent infectious diseases that have had catastrophic consequences. According to Dr Cunnington, to prevent future pandemics, we must change the way humans interact with animals and with the environment.