Article
Rickettsia amblyommatis infecting Amblyomma pseudoconcolor in area of new focus of spotted fever in northeast Brazil
Registro en:
SILVA, Arannadia Barbosa; et al. Rickettsia amblyommatis infecting Amblyomma pseudoconcolor in area of new focus of spotted fever in northeast Brazil. Acta Tropica, v.182, p.305-308, 2018.
0001-706X
10.1016/j.actatropica.2018.03.005
1873-6254
Autor
Silva, Arannadia Barbosa
Cardoso, Karen Medeiros
Oliveira, Stefan Vilges de
Costa, Raylene Medeiros Ferreira
Oliveira, Geane
Amorim, Marinete
Alves, Leucio Câmara
Monteiro, Maria Fernanda Melo
Gazeta, Gilberto Salles
Resumen
In Brazil, active infections of Rickettsia spp. is confirmed in all regions, involving various species of ticks. During
investigation of a new focus of Spotted Fever (SF) incidence in the state of Pernambuco, northeastern Brazil, tick
species Rhipicephalus sanguineus sensu lato (Latreille), and Amblyomma pseudoconcolor were collected from one
Canis familiaris and four Euphractus sexcinctus, respectively, and analized for the presence of rickettsial genes. Ten
A. pseudoconcolor ticks (90.9%) were found to be infected with Rickettsia, whereas no evidence of Rickettsia spp.
was found in R. sanguineus s. l. Genetic analysis based of five rickettsial genes showed that the detected strain is
most closely related to Rickettsia amblyommatis (formerly Candidatus Rickettsia amblyommii). R. amblyommatis
was, for the first time, detected in Amblyomma pseudoconcolor and the results pointed to this tick like a potential
vector in the enzootic cycle of R. amblyommatis in a typical semiarid Brazilian savannah region. In conclusion,
despite the need for further studies to confirm if R. amblyommatis was responsible for the observed case in the
state of Pernambuco, the presence of this bacterium during an SF focussed investigation should be a major
concern in terms of public health due the capacity of SF for rapid and extensive dispersion within Brazilian
territory. 2030-01-01