A single shift of a parasite from one host species to another can trigger catastrophic infectious disease outbreaks. Despite this, scientists continue to debate the role of species diversity in natural environments on the spread of these parasites. A single shift of a parasite from one host species to another can trigger catastrophic infectious disease outbreaks. Despite this, scientists continue to debate the role of species diversity in natural environments on the spread of these parasites. Ecology Molecular & Computational biology Phys.org – latest science and technology news stories