| cases of lyme disease in the united states: locations correlated with distribution of ixodes dammini. | lyme disease, defined by erythema chronicum migrans and sometimes followed by neurologic, cardiac, or joint involvement, is known to have affected 512 patients in the united states. the disease seems to occur in three distinct foci: along the northeastern coast, in wisconsin, and in california and oregon, a distribution that correlates closely with that of ixodes dammini in the first two areas and with ixodes pacificus in the last. the implicated tick, saved by six patients in the northeast, was ... | 1979 | 496106 |
| the global distribution of lyme disease. | erythema chronicum migrans (ecm), the skin lesion characteristic of lyme disease, was first described in sweden in 1909; subsequently, cases of ecm have been reported from at least 19 countries on three continents. in europe cases have occurred within the range of ixodes ricinus ticks, the recognized vector of ecm in europe, although one case outside this range has been ascribed to mosquito bites. in 1970 the first case of ecm acquired in the united states was reported, and in 1977, the full sym ... | 1985 | 3885366 |
| lyme disease: additional evidence of widespread distribution. recognition of a tick-borne dermatitis-encephalitis-arthritis syndrome in an area of known ixodes tick distribution. | lyme disease is a process of unknown etiology that has been linked to bites of ticks of the ixodes ricinus complex. central minnesota is an area of known ixodes dammini distribution. this case represents the first recognition of lyme disease from this area. this case presented as a fluctuating meningoencephalitis with superimposed cranial neuropathy. the characteristic skin lesion, erythema chronicum migrans, was recognized by history, and oligoarticular arthritis subsequently developed. physici ... | 1982 | 7072749 |
| multivariate morphometric discrimination of nymphal and adult forms of the blacklegged tick (acari: ixodidae), a principal vector of the agent of lyme disease in eastern north america. | a morphological study of postlarval stages of the blacklegged tick, ixodes scapularis say, was conducted to examine congruence between northern (formerly i. dammini spielman, clifford, piesman & corwin) and southern morphotypes. the character set totaled 17 for females, 25 for males, and 28 for nymphs. populations from 6 geographic areas, f1 progeny from reciprocal crosses between i. scapularis from massachusetts and georgia, and i. pacificus cooley & kohls from california were measured. charact ... | 1995 | 8551506 |
| multivariate morphometrics of larvae of the blacklegged tick (ixodes scapularis) with notes on nomenclature. | a morphological study of the larval stage of the blacklegged tick, ixodes scapularis, was conducted to further examine congruence between northern and southern morphotypes. preliminary anova revealed that 9 characters were not significantly different; thus 28 characters were used in analyses of a total of 8 groups of i. scapularis originally from minnesota, massachusetts, maryland, missouri, north carolina, georgia, f1 progeny of reciprocal crosses of ticks from massachusetts and georgia, and i. ... | 1996 | 8973400 |
| ehrlichia equi infection of horses from minnesota and wisconsin: detection of seroconversion and acute disease investigation. | equine granulocytic ehrlichiosis (ege) is caused by infection with ehrlichia equi. ege has been reported primarily in northern california, where e equi is transmitted by the tick ixodes pacificus. reports of ege and the emergence of human granulocytic ehrlichia in minnesota prompted a seroprevalence study of e equi in horses of minnesota and wisconsin. tick (ixodes scapularis) endemic areas of minnesota and wisconsin were compared to nonendemic regions of minnesota. indirect fluorescent antibody ... | 2000 | 10830537 |
| acquisition of different isolates of anaplasma phagocytophilum by ixodes scapularis from a model animal. | the prevalence of etiologic agents in ticks reflects the intensity of their transmission in natural cycles and is an important measure of their potential to cause human disease. the distribution of anaplasma phagocytophilum within the range of its primary vectors is patchy. even nearby sites differ dramatically in the prevalence of anaplasma in questing ticks. we hypothesized that this irregular distribution may be due in part to variations in acquisition rates of different isolates of a. phagoc ... | 2004 | 15018773 |
| effects of anaplasma phagocytophilum infection on the molting success of ixodes scapularis (acari: ixodidae) larvae. | we assessed the effects of sympatric (occupying the same or overlapping geographic areas) and allopatric (occurring in separate geographic areas) isolates of anaplasma phagocytophilum on the survival of ixodes scapularis say larvae that were derived from ticks collected in bridgeport, ct. seven isolates of a. phagocytophilum, originating from different geographic regions of the united states, were tested: four isolates from the northeast (bridgeport, dawson, gaillard, and ny-8), two from the mid ... | 2004 | 15185953 |
| new ruminant hosts and wider geographic range identified for babesia odocoilei (emerson and wright 1970). | babesia odocoilei was found to infect two previously unknown host species, desert bighorn sheep (ovis canadensis nelsoni) and musk oxen (ovibos moschatus), both of which are members of the family bovidae. previously, b. odocoilei has been reported in only cervidae hosts. new geographic regions where b. odocoilei infections have not been reported previously include pennsylvania and new york, where fatal babesiosis has occurred in reindeer (rangifer tarandus tarandus); new hampshire, where elk (ce ... | 2005 | 16456156 |
| diagnosis and treatment of lyme disease. | lyme disease is the most common tick-borne disease in the united states. this review details the risk factors, clinical presentation, treatment, and prophylaxis for the disease. information was obtained from a search of the pubmed and medline databases (keyword: lyme disease) for articles published from august 31, 1997, through september 1, 2007. approximately 20,000 cases of lyme disease are reported annually. residents of the coastal northeast, northwest california, and the great lakes region ... | 2008 | 18452688 |
| molecular detection and identification of rickettsia species in ixodes pacificus in california. | we amplified 16s rrna, glta, and ompa genes from ixodes pacificus by polymerase chain reaction. sequencing, blast analysis, and phylogenetic constructions indicated that two rickettsia phylotypes are present in i. pacificus. while phylotype g021 has high homology to ixodes scapularis endosymbiotic rickettsia, phylotype g022 is a deeply branched novel spotted fever group rickettsia. | 2011 | 21413886 |
| 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 ... | 2012 | 22214269 |