What part do non-human primates, like monkeys and apes, play in the transmission of yellow fever? This episode focuses on monitoring and response work in the rainforests of Argentina, where yellow fever is present among howler monkeys - and can be passed on to humans. Dr María Morales and Dr Silvina Goenaga are from Argentina’s Institute for Human Viral Diseases (INEVH). Sound effects in this episode are obtained from zapsplat.com