This field guide was designed by the Pan American Health Organization (PAHO) to offer health workers at different levels of the health care system and different programs in the schools of health sciences the tools to control jungle yellow fever and prevent its reurbanization in the Region of the Americas. It emphasizes clinical and epidemiological aspects of the disease, together with prevention and control strategies. It also offers practical exercises on a clinical case and outbreak for use in training health workers, especially local personnel in enzootic areas. The field guide covers pre.