My colleagues and I recently analysed two outbreaks of respiratory disease in two different chimpanzee groups, both located in Uganda’s Kibale National Park…Initially, we feared that the same virus caused both outbreaks, which would mean a single virus had been rapidly transmitted throughout the forest. But our team leader, Dr Tony Goldberg of the University of Wisconsin-Madison, tested samples, and we learned that the outbreaks were caused by two different viruses commonly found in humans.