Abstract
Expansion of Brazilian Spotted Fever (BSF) transmission areas in the State of São Paulo has been associated with expansion of capybaras population. Capybaras are the main amplifying hosts of the BSF etiological agent (Rickettsia rickettsii) for Amblyomma sculptum ticks. However, many areas where capybaras and A. sculptum are established remain free of R. rickettsii, suggesting that other …