While Rio de Janeiro and its famous beaches provide the touristic backdrop of the World Cup, the fevered grip of the world’s most popular sporting event can be felt even in some of the most isolated areas of the rain forest, where outsiders seldom visit. “Football is in our blood,” said Andre Pereira da Silva, 32, the chief of a small community of Sateré-Mawé Indians in Manaus, the largest city in the Amazon, who served as a guide.