Brazil president Rousseff visits Oswaldo Cruz Foundation in Rio Brazilian president Dilma Rousseff visited the Oswaldo Cruz Foundation (Fiocruz) Thursday in Rio de Janeiro, but did not comment on the request by prosecutors to arrest former head of state Luiz Inacio Lula da Silva. Fiocruz announced a research project to eliminate dengue using Aedes aegypti mosquitoes infected with the Wolbachia bacteria, which can prevent mosquito eggs from hatching. IMAGES