| cytosystematics of five north american amblyomma (acarina: ixodidae) species. | the karyotypes of 5 species of amblyomma ticks found in north america were examined for the presence and location of constitutive heterochromatin (c-bands). all specimens examined had 20 autosomes and an xx:xo sex-determining system, with the x being the largest element in the karyotype. except as noted in text, the autosomes of all species were acrocentric and heterochromatin was restricted to the centromeric region. the third largest autosome in 4 of the 5 species displayed a consistent band o ... | 1995 | 7876973 |
| isolation of rickettsia rhipicephali and rickettsia bellii from haemaphysalis juxtakochi ticks in the state of são paulo, brazil. | in the present study, attempts to isolate rickettsia in cell culture were performed individually in seven specimens of haemaphysalis juxtakochi ticks collected in the state of são paulo (southeastern brazil). rickettsia was successfully isolated by the shell vial technique and established in vero cell culture from six ticks (six isolates). dna extracted from infected cells of these isolates was tested by pcr and dna sequencing, using genus-specific rickettsia primers targeting the genes glta, ht ... | 2007 | 17142361 |
| detection of lyme disease spirochete, borrelia burgdorferi sensu lato, including three novel genotypes in ticks (acari: ixodidae) collected from songbirds (passeriformes) across canada. | lyme disease is reported across canada, but pinpointing the source of infection has been problematic. in this three-year, bird-tick-pathogen study (2004-2006), 366 ticks representing 12 species were collected from 151 songbirds (31 passerine species/subspecies) at 16 locations canada-wide. of the 167 ticks/pools tested, 19 (11.4%) were infected with borrelia burgdorferi sensu lato (s.l.). sequencing of the rrf-rrl intergenic spacer gene revealed four borrelia genotypes: b. burgdorferi sensu stri ... | 2010 | 20618658 |
| amblyomma imitator ticks as vectors of rickettsia rickettsii, mexico. | real-time pcr of amblyomma imitator tick egg masses obtained in nuevo leon state, mexico, identified a rickettsia species. sequence analyses of 17-kd common antigen and outer membrane protein a and b gene fragments showed to it to be r. rickettsii, which suggested a potential new vector for this bacterium. | 2010 | 20678325 |
| vector potential and population dynamics for amblyomma inornatum. | we studied the natural life cycle of amblyomma inornatum and its vector potential in south texas. this tick is distributed throughout south texas and most of central america. a. inornatum represented 1.91% of the ticks collected by carbon dioxide traps during a study of free-living ticks in the tamaulipan biotic province in south texas. the life cycle of a. inornatum in south texas showed a clear seasonal pattern consistent with one generation per year. nymphs emerged in the spring with a peak i ... | 2015 | 25881916 |
| update on tick-borne rickettsioses around the world: a geographic approach. | tick-borne rickettsioses are caused by obligate intracellular bacteria belonging to the spotted fever group of the genus rickettsia. these zoonoses are among the oldest known vector-borne diseases. however, in the past 25 years, the scope and importance of the recognized tick-associated rickettsial pathogens have increased dramatically, making this complex of diseases an ideal paradigm for the understanding of emerging and reemerging infections. several species of tick-borne rickettsiae that wer ... | 0 | 24092850 |
| amblyomma imitator, a new species of tick from texas and mexico, and remarks on the synonymy of a. cajennense (fabricius) (acarina-ixodidae). | | 1958 | 13564359 |
| reestablishment of amblyomma tenellum koch, 1844 (acari: ixodidae). | herein, amblyomma tenellumkoch, 1844 (ixodidae) is reestablished as a valid tick name and removed from the synonymy list of amblyomma cajennense (fabricius, 1787), while amblyomma imitatorkohls, 1958, is relegated to a junior synonym of a. tenellum. amblyomma tenellum is redescribed based on the examination of male type specimens collected by deppe at the beginning of the 19th century in mexico and described by koch in 1844. | 2014 | 25017501 |
| amblyomma cajennense (fabricius, 1787) (acari: ixodidae), the cayenne tick: phylogeography and evidence for allopatric speciation. | amblyomma cajennense f. is one of the best known and studied ticks in the new world because of its very wide distribution, its economical importance as pest of domestic ungulates, and its association with a variety of animal and human pathogens. recent observations, however, have challenged the taxonomic status of this tick and indicated that intraspecific cryptic speciation might be occurring. in the present study, we investigate the evolutionary and demographic history of this tick and examine ... | 2013 | 24320199 |
| tick-borne rickettsial pathogens in questing ticks, removed from humans and animals in mexico. | tick-borne rickettsial diseases (tbrd) are commonly encountered in medical and veterinary clinical settings. the control of these diseases is difficult, requiring disruption of a complex transmission chain involving a vertebrate host and ticks. the geographical distribution of the diseases is related to distribution of the vector, which is an indicator of risk for the population. a total of 1107 were collected by tick drag from forests, ecotourism parks and hosts at 101 sites in 22 of the 32 sta ... | 0 | 26726019 |