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Background  Infections with tick-borne rickettsiae can cause diseases well known in humans but still not so well characterized in dogs. Susceptibility to infection depends on the virulence of  Rickettsia  spp. and only a few of them have been described to cause disease in dogs. The aim of this study was to investigate the exposure to  Rickettsia  spp. among a group of pet dogs from Luanda, Angola.    Results  Out of 103 dogs included in the study, 62 (60.2%) were infested with ticks. Plasma specimens tested for serology by an immunofluorescence assay (IFA) revealed that six (5.8%) dogs had detectable immunoglobulin G (IgG) antibodies to spotted fever group  Rickettsia  (SFGR), with endpoint titers of 64 for two dogs, 128 for three dogs and 1024 for one dog. From the seropositive group of dogs, five (83%) of them were males, with their age ranging from 1 to 8 years old. Among the seropositive dogs, four (66.7%) were parasitized with ticks and no breed (or cross) was found to be associated with specific antibodies.  Rickettsia  spp. DNA was detected by nested-polymerase chain reaction (PCR) in two (1.9%) dogs that were found to be seronegative.    Conclusions  Seroprevalence and molecular detection of  Rickettsia  spp. infection in this group of pet dogs from Luanda is low compared with other studies performed in the same type of hosts in other areas. Although many dogs were parasitized with ticks, a low prevalence of  Rickettsia  spp. could be related with the hypothesis of a low rickettsial prevalence in the infesting ticks. This study provides evidence that dogs in Luanda are exposed to  Rickettsia  spp., but further studies are needed to better characterize the bacterial infections in dogs and in their ectoparasites.

Serological and molecular detection of spotted fever group Rickettsia in a group of pet dogs from Luanda, Angola