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Update on Tick-Borne Rickettsioses around the World: a Geographic Approach
The current knowledge on tick-borne rickettsiae and ricksettsioses is presented using a geographic approach toward the epidemiology of these diseases.
Ecology of Rickettsia in South America
  • M. Labruna
  • Biology, Medicine
    Annals of the New York Academy of Sciences
  • 1 May 2009
In Brazil, capybaras and opossums are the most probable amplifier hosts for R. rickettsii, among A. cajennense ticks, and small rodents for A. aureolatum, which implies that R. gaelic needs amplifier vertebrate hosts for its perpetuation in nature, in order to create new lines of infected ticks (horizontal transmission).
Rickettsia bellii and Rickettsia amblyommii in Amblyomma Ticks from the State of Rondônia, Western Amazon, Brazil
This study adds South America to the known geographic distribution of R. amblyommii and reports rickettsiae in six Amblyomma species for the first time.
Genetic analysis of ticks belonging to the Rhipicephalus sanguineus group in Latin America.
The present results coupled with recent studies support the presence of at least two species under the taxon R. sanguineus in the New World, and show that even in the Old World, the taxo might be represented by more than one species.
Rickettsia Species Infecting Amblyomma cooperi Ticks from an Area in the State of São Paulo, Brazil, Where Brazilian Spotted Fever Is Endemic
Results do not support the role of A. cooperi in the ecology of R. rickettsii in the area studied, but they add two more species of ricksettsiae to the poorly developed list of species occurring in ticks in South America.
Ticks (Ixodidae) on humans in South America
Twenty eight species of Ixodidae have been found on man in South America and ticks of the genus Ixodes do not appear to be major players in transmitting diseases to human.
Reassessment of the taxonomic status of Amblyomma cajennense () with the description of three new species, Amblyomma tonelliae n. sp., Amblyomma interandinum n. sp. and Amblyomma patinoi n. sp., and
This study provides descriptions and redescriptions, scanning electron microscopic and stereomicroscopic images, updated synonymies, information on geographical distributions, and host associations for each of the 6 species.
Ticks (Acari: Ixodida) on wild carnivores in Brazil
Tick infestation remains unreported for 5 of the 26 Carnivora species native in Brazil: Oncifelis geoffroyi (Geoffroy’s cat), Atelocynus microtis (short-eared dog), Pteronura brasiliensis (giant otter), Mustela africana (Amazon weasel), and Bassaricyon gabbii (olingo).
Detection of Rickettsia rickettsii in the tick Amblyomma cajennense in a new Brazilian spotted fever-endemic area in the state of Minas Gerais.
The present study showed molecular evidence for the presence of R. rickettsii in A. cajennense from a BSF-endemic area in Coronel Pacheco, state of Minas Gerais.
Rickettsia parkeri in Brazil
The Rickettsia parkeri isolate was successfully established in Vero cell culture and molecular characterization of the agent was performed by DNA sequencing of portions of the rickettsial genes gltA, htrA, ompA, and ompB.