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Rickettsia felis is an emerging insect-borne rickettsial pathogen and the causative agent of
flea-borne spotted fever. First described as a human pathogen from the USA in 1991, R. felis …

Owing to the potential role of the tick Amblyomma cooperi in the enzootic cycle of Rickettsia
rickettsii, the etiologic agent of Brazilian spotted fever (BSF), this study evaluated infection by …

We propose genetic guidelines for the classification of rickettsial isolates at the genus,
group, and species levels by using sequences of the 16S rRNA (rrs) gene and four protein …

Between 1984 and 2004, nine more species or subspecies of spotted fever rickettsiae were
identified as emerging agents of tick-borne rickettsioses throughout the world. Six of these …

This study evaluates the rickettsial presence in Amblyomma ticks from eight areas of the
Amazon forest in Rondônia, Brazil. The following tick species (number in parentheses) were …

Background The genome sequence of Rickettsia felis revealed a number of rickettsial
genetic anomalies that likely contribute not only to a large genome size relative to other …

Obligately intracytosolic rickettsiae that cycle between arthropod and vertebrate hosts cause
human diseases with a spectrum of severity, primarily by targeting microvascular endothelial …

Abstract Al. pha. pro. te. o. bac. te′ ri. a. Gr. n. alpha name of first letter of Greek alphabet;
Gr. n. Proteus ocean god able to change shape; Gr. n. bakterion a small rod; ML fem. pl. n …

Rickettsiae cause some of the most severe human infections, including epidemic typhus and
Rocky Mountain spotted fever. Substantial progress has been made in research into the …