Serological and molecular detection of spotted fever group Rickettsia in a group of pet dogs from Luanda, Angola - Barradas, P.F.; Vilhena, H.; Oliveira, A.C.; Granada, S.; Amorim, I.; Ferreira, P.; Cardoso, L.; Gärtner, F.; De Sousa, R. (Parasites and Vectors, 2017)