Map of the state of São Paulo showing the collection sites and events related to yellow fever in 2000 and 2008. Black dots represent the collection sites by number. The larger polygons represent the main river basins of the state. The smaller polygons not filled in indicate municipalities with entomological collections or autochthonous human cases of yellow fever in 2000 (H0) and 2008 (H8). When filled in gray, the area indicates deaths of monkeys in 2008. The dashed line represents the region where the epizootic outbreaks have been confirmed by Adolfo Lutz Institute/State Health Secretariat of São Paulo, Brazil.