Since the plague killed millions of Europeans in the Middle Ages, vector-borne diseases — those that rely on insects and animals to spread infectious agents — have posed a serious threat to public health. Today, the most dangerous vector on earth is the mosquito. From malaria to yellow fever to West Nile virus, mosquito-borne diseases continue to threaten the health of millions around the world. Deadly Messengers recounts the stories of heroic scientists and health workers who battled against the mosquito, and examines current efforts to control dangerous and spreading vector-borne diseases.