rocky mountain spotted fever from an unexpected tick vector in arizona.rocky mountain spotted fever is a life-threatening, tick-borne disease caused by rickettsia rickettsii. this disease is rarely reported in arizona, and the principal vectors, dermacentor species ticks, are uncommon in the state. from 2002 through 2004, a focus of rocky mountain spotted fever was investigated in rural eastern arizona.200516093467
isolation and identification of rickettsia massiliae from rhipicephalus sanguineus ticks collected in arizona.twenty rhipicephalus sanguineus ticks collected in eastern arizona were tested by pcr assay to establish their infection rate with spotted fever group rickettsiae. with a nested pcr assay which detects a fragment of the rickettsia genus-specific 17-kda antigen gene (htra), five ticks (25%) were found to contain rickettsial dna. one rickettsial isolate was obtained from these ticks by inoculating a suspension of a triturated tick into monolayers of vero e6 monkey kidney cells and xtc-2 clawed toa ...200616885311
rocky mountain spotted fever in arizona: documentation of heavy environmental infestations of rhipicephalus sanguineus at an endemic site.a recent epidemiologic investigation identified 16 cases and 2 deaths from rocky mountain spotted fever (rmsf) in two eastern arizona communities. prevalence studies were conducted by collecting free-living ticks (acari: ixodidae) from the home sites of rmsf patients and from other home sites within the community. dry ice traps and flagging confirmed heavy infestations at many of the home sites. only rhipicephalus sanguineus ticks were identified and all developmental stages were detected. it is ...200617114735
an outbreak of rocky mountain spotted fever associated with a novel tick vector, rhipicephalus sanguineus, in arizona, 2004: preliminary report.this study describes preliminary results of an investigation of rmsf in arizona associated with the brown dog tick, rhipicephalus sanguineus. high numbers of dogs and heavy infestations of ticks created a situation leading to human disease.200617114736
spotted fever group rickettsial infection in dogs from eastern arizona: how long has it been there?a serosurvey of free-roaming dogs for antibodies to spotted fever group rickettsiae was conducted using archival samples that had been collected in the white mountain region of eastern arizona during a plague study in 1996. immunoglobulin g antibodies to rickettsia rickettsii (5.1%) and to r. rhipicephali (3.6%) were demonstrated, and no cross-reactive samples were identified. this study indicates that r. rickettsii was likely present in the dog populations in this area prior to the recognition ...200617114769
molecular typing of novel rickettsia rickettsii isolates from isolates of rickettsia rickettsii were obtained from a skin biopsy, two whole-blood specimens, and from rhipicephalus sanguineus ticks from eastern arizona. molecular typing of seven isolates of r. rickettsii and dna samples from two other rh. sanguineus ticks infected with r. rickettsii was conducted by pcr and dna sequencing of rompa and 12 variable-number tandem repeat regions (vntrs). all dna specimens from arizona were identical to each other and to reference human and dermacentor and ...200617114781
serologic evidence for exposure to rickettsia rickettsii in eastern arizona and recent emergence of rocky mountain spotted fever in this region.during 2002 through 2004, 15 patients with rocky mountain spotted fever (rmsf) were identified in a rural community in arizona where the disease had not been previously reported. the outbreak was associated with rickettsia rickettsii in an unexpected tick vector, the brown dog tick (rhipicephalus sanguineus), which had not been previously associated with rmsf transmission in the united states. we investigated the extent of exposure to r. rickettsii in the local area through serologic evaluations ...200617187578
detection of rickettsia rickettsii and bartonella henselae in rhipicephalus sanguineus ticks from california.sixty-two questing adult rhipicephalus sanguineus (latreille) ticks were collected by direct removal from blades of turfgrass and adjacent concrete walkways at a suburban home in riverside county, ca, and tested for the presence of rickettsia, bartonella, and ehrlichia dna. polymerase chain reaction (pcr) was used to amplify fragments of the 17-kda antigen gene and the rompa gene of the spotted fever group rickettsiae. one male tick contained r. rickettsii dna; its genotype differed from r. rick ...200717294935
high prevalence of tick-borne pathogens in dogs from an indian reservation in northeastern arizona.we evaluated the serological and molecular prevalence of selected organisms in 145 dogs during late spring (may/june) of 2005 and in 88 dogs during winter (february) of 2007 from the hopi indian reservation. additionally, in 2005, 442 ticks attached to dogs were collected and identified as rhipicephalus sanguineus. infection with or exposure to at least one organism was detected in 69% and 66% of the dogs in may/june 2005 and february 2007, respectively. exposure to spotted fever group (sfg) ric ...201019469667
evidence of exposure to spotted fever group rickettsiae among arizona dogs outside a previously documented outbreak area.since 2003, two communities in eastern arizona have experienced a sustained outbreak of rocky mountain spotted fever (rmsf), caused by rickettsia rickettsii, associated with transmission by rhipicephalus sanguineus, the brown dog tick; 70 human cases, including eight deaths, were reported from these communities during 2003 through 2008. in both of the affected communities, antibodies to spotted fever group rickettsiae (sfgr) were present in dogs before the notice of the first human cases, sugges ...201120042069
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