AZEVEDO, S.; AGUIAR, D.; AQUINO, S.; ORLANDELLI, R.; FERNANDES, A.; UCHÔA, I. Seroprevalence and risk factors associated to Ehrlichia canis in dogs from the semiarid of Paraíba State, Northeastern Brazil. Brazilian Journal of Veterinary Research and Animal Science, v. 48, n. 1, p. 14-18, 1 fev. 2011.