Tick-borne rickettsioses are caused by obligate intracellular bacteria belonging to the
spotted fever group of the genus Rickettsia. These zoonoses are among the oldest known …

Spotted-fever-caused Rickettsia rickettsii infection is in Brazil the major tick-borne zoonotic
disease. Recently, a second and milder human rickettsiosis caused by an agent genetically …

Until the year 2000, only three Rickettsia species were known in South America:(i) Rickettsia
rickettsii, transmitted by the ticks Amblyomma cajennense, and Amblyomma aureolatum …

Background Brazilian spotted fever (BSF), caused by the bacterium Rickettsia rickettsii, has
been associated with the transmission by the tick Amblyomma sculptum, and one of its main …

The tick-borne bacterium Rickettsia rickettsii is the aetiological agent of Brazilian spotted
fever (BSF). The present study evaluated tick infestations on wild and domestic animals, and …

Rickettsiae are obligately intracellular bacteria that are transmitted to vertebrates by a variety
of arthropod vectors, primarily by fleas and ticks. Once transmitted or experimentally …

Rickettsioses are among the oldest known infectious diseases. In spite of this, and of the
extensive research carried out, many aspects of the biology and epidemiology of tick-borne …

Background Brazilian spotted fever (BSF), caused by the bacterium Rickettsia rickettsii, is
the deadliest spotted fever of the world. In most of the BSF-endemic areas, capybaras …

Ticks are obligate blood feeding ectoparasites that transmit a wide variety of pathogenic
microorganisms to their vertebrate hosts. Amblyomma sculptum is vector of Rickettsia …

In the laboratory, Amblyomma cajennense (Acari: Ixodidae)(Fabricius) larvae, nymphs and
adults were exposed to Rickettsia rickettsii by feeding on needle‐inoculated animals, and …