serologic testing for human granulocytic ehrlichiosis at a national referral indirect immunofluorescence assay (ifa) was used to identify patients with antibodies reactive to the human granulocytic ehrlichiosis (hge) agent. serum samples collected from clinically ill individuals were submitted to the centers for disease control and prevention by physicians via state health departments from throughout the united states and tested against a panel of ehrlichial and rickettsial pathogens. antibodies reactive to the hge agent were detected in 142 (8.9%) of 1,602 individual ...19999986812
ticks and tick-borne pathogens and putative symbionts of black bears (ursus americanus floridanus) from georgia and florida.ticks were collected from 38 black bears (ursus americanus floridanus) from northwestern florida (n = 18) from 2003 to 2005 and southern georgia (n = 20) in 2006. five species (amblyomma americanum, a. maculatum, dermacentor variabilis, ixodes scapularis, and i. affinis) were collected from florida bears, and 4 species (a. americanum, a. maculatum, d. variabilis, i. scapularis) were collected from bears in georgia. ixodes scapularis was the most frequently collected tick, followed by d. variabil ...200919413369
anaplasma phagocytophilum in small mammals and ticks in northeast florida.human anaplasmosis is an emerging tick-borne disease in the united states, but few studies of the causative agent, anaplasma phagocytophilum, have been conducted in southeastern states. the aim of this study was to determine if a. phagocytophilum is present in small mammals and ticks in northeast florida. polymerase chain reaction assays designed to amplify portions of the major surface protein 2 gene (p44), 16s rdna, and groesl operons were used to test rodent blood and tick dna samples for the ...201222548563
experimental and field studies on the suitability of raccoons (procyon lotor) as hosts for tick-borne pathogens.we investigated the experimental susceptibility and natural exposure of raccoons (procyon lotor) to five tick-borne pathogens of human and veterinary importance, ehrlichia canis, e. chaffeensis, e. ewingii, anaplasma phagocytophilum (apvariant 1 and ap-ha hge-1 strains), and borrelia lonestari. infections were assessed by polymerase chain reaction (pcr), indirect fluorescent antibody (ifa) testing, and/or culture isolation methods for at least 30 days postinoculation (dpi). two e. chaffeensis-in ...200818429696
the pcs20 pcr assay for ehrlichia ruminantium does not cross-react with the novel deer ehrlichial agent found in white-tailed deer in the united states of america.white-tailed deer are susceptible to heartwater (ehrlichia [cowdria] ruminantium infection) and are likely to suffer high mortality if the disease spreads to the united states. it is vital, therefore, to validate a highly specific and sensitive detection method for e. ruminantium infection that can be reliably used in testing white-tailed deer, which are reservoirs of antigenically or genetically related agents such as ehrlichia chaffeensis, anaplasma (ehrlichia) phagocytophilum (hge agent) and ...200415373331
prevalence of the agent of human granulocytic ehrlichiosis in ixodes scapularis (acari: ixodidae) in the coastal southeastern united states.human granulocytic ehrlichiosis (hge) is an emerging tick-borne disease recently recognized in the united states. the blacklegged tick, ixodes scapularis say, is the principle vector in the eastern united states. the disease has been commonly reported in the northeastern and upper midwestern states; however, suitable vectors and reservoir hosts exist in the southeast. to assay the prevalence of the hge agent in vector ticks, we screened 818 individual i. scapularis from 15 locations in south car ...200211931023
antibodies to granulocytic ehrlichiae in white-footed and cotton mice in eastern united states.serum samples, collected from peromyscus leucopus (white-footed mouse) or peromyscus gossypinus (cotton mouse) during 1987 through 1990 in florida, georgia, maryland, mississippi, and north carolina (usa), and in 1997 in southern connecticut were analyzed by indirect fluorescent antibody (ifa) staining methods or western blot procedures for antibodies to granulocytic ehrlichiae. of the 82 sera from white-footed mice in connecticut tested by ifa methods with either the bds or nch-1 strain of the ...199910231752
serologic evidence of infection with ehrlichia spp. in wild rodents (muridae: sigmodontinae) in the united states.rodent (muridae: sigmodontinae) blood and sera collected from 14 states were tested for seroreactivity to a cultured isolate of the human granulocytic ehrlichiosis (hge) agent by using an indirect immunofluorescence assay. of the 1,240 samples tested, 136 (11%) were found to be reactive at titers of > or = 32. rodents with hge agent-specific antibodies were found in new york (23% of 491 samples; geometric mean endpoint titer [gmt] = 441), connecticut (11% of 100 samples; gmt = 481), california ( ...19989508298
the first isolation, in vitro propagation, and genetic characterization of ehrlichia canis in israel.ehrlichia canis, the etiologic agent of canine ehrlichiosis, was isolated in israel from a naturally infected dog with acute signs of the disease. the organism designated e. canis 611, was passaged experimentally to a beagle, from which it was propagated in primary canine monocytes. the organism was then grown in vitro in a continuous canine cell line, dh82. nine beagles subsequently injected with whole e. canis-infected blood all developed typical symptoms of ehrlichiosis. an indirect immunoflu ...19968686178
detection of anaplasma phagocytophilum in ixodid ticks from equine-inhabited sites in the southeastern united states.abstract anaplasma phagocytophilum is a vector-borne, obligate intracellular bacterium that invades the neutrophils and eosinophils of infected individuals, causing granulocytic anaplasmosis. equine cases have previously been reported in the united states from california, florida, and connecticut, but limited surveillance studies in the southeast have been conducted. the objective of this study was to determine a. phagocytophilum prevalence in ixodes scapularis ticks at southeastern u.s. horse ...201222214269
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