Brazil Troops Start Anti-Dengue Foot Patrols BRAZIL: April 9, 2008 RIO DE JANEIRO - Hundreds of Brazilian soldiers swapped ammunition packs for yellow bags of mosquito larvicide on Tuesday, taking the battle against a deadly dengue fever epidemic to the streets of Rio de Janeiro. The outbreak of the mosquito-borne disease has killed 68 people in the state of Rio, most of them in its capital -- a major tourism destination.