"Candidatus Rickettsia asemboensis" is an obligate intracellular bacterium of the Rickettsiales order, genetically related to species belonging to the Rickettsia felis group, agents of flea-borne spotted fever. Here we report for the first time the detection of "Ca. R. asemboensis", a flea-associated organism, in Rhipicephalus sanguineus ticks. It is the first occurrence of this emerging bacterium in Brazil, which increases the geographical distribution of this R. felis-like agent.
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http://dx.doi.org/10.1016/j.actatropica.2016.12.008 | DOI Listing |
Parasit Vectors
December 2024
Global Health and Tropical Medicine- Institute of Hygiene and Tropical Medicine, NOVA University of Lisbon, Rua da Junqueira 100, 1349-008, Lisbon, Portugal.
Background: Tick-borne rickettsioses (TBR) are emerging, neglected, zoonoses, caused by intracellular α-proteobacteria of the genus Rickettsia, that pose a growing public health concern. The aim of the present study was to evaluate rickettsial infections in questing ticks collected from four different ecological areas in mainland Portugal.
Methods: Over a two-year period, a total of 707 questing ticks were collected.
Parasit Vectors
December 2024
Laboratorio Clínico, Facultad de Medicina Clínica Alemana, Clínica Alemana de Santiago, Universidad del Desarrollo, Santiago, Chile.
Candidatus Orientia chiloensis causes scrub typhus over a wide geographical range in southern Chile. The life cycle, including vectors and reservoirs of this novel rickettsial pathogen, is incompletely understood. We analyzed rodent tissue and rodent-associated mite samples collected during a field study in six localities on Chiloé Island, where human scrub typhus cases have occurred.
View Article and Find Full Text PDFCurr Res Parasitol Vector Borne Dis
November 2024
Unit of Vector Ecology, Pasteur Institute of Tunis, Tunis, Tunisia.
The taxa and are sympatric in Tunisia. The genetics underlying their morphological differences are unresolved. In this study, ticks collected in Jouza-Amdoun, Tunisia, were morphologically identified and sequenced using Oxford Nanopore Technologies.
View Article and Find Full Text PDFFront Cell Infect Microbiol
December 2024
School of Biological, Environmental, and Earth Sciences, University of Southern Mississippi, Hattiesburg, MS, United States.
Acta Trop
December 2024
Vector-Borne Bioagents Laboratory (VBBL), Department of Pathology, Reproduction, and One Health, School of Agricultural and Veterinary Sciences, São Paulo State University "Júlio de Mesquita Filho" (FCAV/UNESP), Jaboticabal Campus, Via de Acesso Prof. Paulo Donato Castellane, s/n, Rural Zone, Jaboticabal, SP, CEP: 14884-900, Brazil. Electronic address:
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