| fatal cases of rocky mountain spotted fever in family clusters--three states, 2003. | rocky mountain spotted fever (rmsf), a tickborne infection caused by rickettsia rickettsii and characterized by a rash, has a case-fatality rate as high as 30% in certain untreated patients. even with treatment, hospitalization rates of 72% and case-fatality rates of 4% have been reported. this report summarizes the clinical course of three fatal cases of rmsf in children and related illness in family members during the summer of 2003. these cases underscore the importance of 1) prompt diagnosis ... | 2004 | 15152183 |
| 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. | 2005 | 16093467 |
| 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 ... | 2006 | 17114735 |
| 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 ... | 2006 | 17114769 |
| molecular typing of novel rickettsia rickettsii isolates from arizona. | seven 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 ... | 2006 | 17114781 |
| 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 ... | 2006 | 17187578 |
| 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 ... | 2007 | 17294935 |
| 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 ... | 2011 | 20042069 |