Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
|---|
| area control of larvae of the lone star tick (acari: ixodidae) with acaricides. | 1983 | 6186711 | |
| adenosine-3',5'-monophosphate in salivary glands of unfed and feeding female lone star ticks, amblyomma americanum (l.). | basal levels of camp in salivary glands of female lone star ticks were found to be about 5 pmoles/mg protein during all stages of feeding. glands stimulated with 10(-5)m dopamine and 10(-5)m dopamine plus theophylline exhibited significant increases in camp/mg protein. after stimulation by 10(-5)m dopamine was removed, camp decreased faster in glands from slowly feeding ticks (less than 200 mg) than in glands of rapidly feeding ticks (greater than 200 mg). | 1984 | 6149877 |
| a dopamine sensitive adenylate cyclase in the salivary glands of amblyomma americanum (l.). | 1. enzyme activity, basal or dopamine-stimulated (10 microm), was linear with time to 25 min and with protein concentration to 0.8 mg protein/ml of final assay volume. activity was maximal between ph 7.0 and 7.5. 2. mg2+ maximally stimulated basal or dopamine-sensitive adenylate cyclase activity at about 4 mm. 3. adenylate cyclase had a km of 0.042 mm for atp and maximum velocities for basal and dopamine-stimulated activity of 107 and 179 pmol cyclic amp formed/mg protein per min, respectively. ... | 1982 | 6125338 |
| wear and wash persistence of permethrin used as a clothing treatment for personal protection against the lone star tick (acari: ixodidae). | 1982 | 6123602 | |
| control of the lone star tick on cattle. | 1967 | 6081042 | |
| arbovirus studies in the ohio-mississippi basin, 1964-1967. vii. lone star virus, a hitherto unknown agent isolated from the tick amblyomma americanum (linn). | 1969 | 5810802 | |
| insecticides for control of the lone star tick tested in the laboratory and as high- and ultra-low-volume sprays in wooded areas. | 1968 | 5662002 | |
| fine structure of tarsal sensilla in the tick amblyomma americanum (l.). | 1971 | 5541841 | |
| effect of age on the susceptibility of nymphs of the lone star tick to insecticides. | 1970 | 5488795 | |
| mating behavior and reproduction of the lone star tick, amblyomma americanum. | 1970 | 5449398 | |
| environmental alteration in recreational areas by mechanical and chemical treatment as a means of lone star tick control. | 1970 | 5441234 | |
| effect of age on the attachment rate of the parasitic stages of the lone star tick, amblyomma americanum (linnaeus) (acarina: ixodidae), in the laboratory. | 1970 | 5435814 | |
| ecology of tick vectors of american spotted fever. | the author reviews the natural history of the tick vectors of american spotted fever. the discussion concerns the ecology of the rocky mountain wood tick, dermacentor andersoni, the american dog tick, dermacentor variabilis, and the lone-star tick, amblyomma americanum, all of which are proven vectors of rocky mountain spotted fever to man. also included are the rabbit tick, haemaphysalis leporispalustris and dermacentor parumapertus, which very rarely bite man but which are considered of import ... | 1969 | 5306621 |
| engorgement and reproduction of lone star ticks (amblyomma americanum (l.)) treated with gamma-radiation. | 1966 | 5296972 | |
| water balance in the lone star tick (acarina: ixodidae): the effects of relative humidity and temperature on weight changes and total water content. | 1971 | 5160247 | |
| further observations on the control of lone star ticks (acarina: ixodidae) through integrated control procedures. | 1971 | 5153597 | |
| measurement of physical parameters to determine the suitability of modified woodlots as lone star tick habitat. | 1971 | 5153596 | |
| the ecology and behavior of the lone star tick (acarina: ixodidae). ii. activity and survival in different ecological habitats. | 1971 | 5153595 | |
| the ecology of the lone star tick, amblyomma americanum (l.), in two contrasting habitats in virginia (acarina: ixodidae). | 1971 | 5153583 | |
| the ecology and behavior of the lone star tick (acarina: ixodidae). i. the relationship between vegetative habitat type and tick abundance and distribution in cherokee co., oklahoma. | 1971 | 5118876 | |
| preliminary observations on controlled burning for lone star tick (acarina: ixodidae) control in woodlots. | 1972 | 5080432 | |
| chemo-attraction in the lone star tick (acarina: ixodidae). i. response of different developmental stages to carbon dioxide administered via traps. | 1972 | 5057498 | |
| 2,6-dichlorophenol, sex pheromone of the lone star tick. | the compound 2,6-dichlorophenol was identified from female lone star ticks, amblyomma americanum, and is believed to be a sex pheromone of this arthropod. the natural occurrence of a chlorinated organic compound in a land animal is new. the presence of similar compounds of exogenous origin is common in animals, but efforts to implicate an outside source for the halogenated phenol have failed. | 1972 | 5054146 |
| fine structural analysis of palpal receptors in the tick amblyomma americanum(l.). | 1972 | 5042252 | |
| a method of collecting nymphal and adult lone star ticks, amblyomma americanum (l.) (acarina: ixodidae), from woodlots. | 1972 | 5036200 | |
| age and susceptibility of nymphal lone star ticks to selected ixodicides. | 1972 | 5008957 | |
| fine structure of the central nervous system of dermacentor variabilis (say), amblyomma americanum (l.), and argas arboreus kaiser, hoogstraal, and kohls (ixodoidea). | 1974 | 4852052 | |
| the ecology and behavior of the lone star tick (acarina: ixodidae). v. abundance and seasonal distribution in different habitat types. | 1973 | 4779928 | |
| the effects of desiccation and rehydration on the lone star tick. | 1973 | 4773930 | |
| lone star tick: laboratory tests of acaricides. | 1973 | 4770947 | |
| the ecology and behavior of the lone star tick (acarina: ixodidae). iv. the daily and seasonal activity patterns of adults in different habitat types. | 1973 | 4744033 | |
| the ecology and behavior of the lone star tick (acarina: ixodidae). 3. the effect of season on molting time and post-molt behavior of engorged nymphs and adults. | 1973 | 4707757 | |
| permeability of tarsal sensilla in the tick amblyomma americanum l. (acarina, ixodidae). | 1972 | 4647364 | |
| resistance of purebred brahman, hereford, and brahman times hereford crossbred cattle to the lone star tick, amblyomma americanum (acarina: ixodidae). | 1974 | 4455918 | |
| control of 36c1 uptake by isolated salivary glands of the lone star tick. | 1974 | 4412631 | |
| ultrastructure of haller's organ in the tick amblyomma americanum (l.). | 1972 | 4334800 | |
| hematological changes in white-tailed deer fawns, odocoileus virgianianus, infested with theileria-infected lone star ticks. | 1973 | 4202517 | |
| weight changes in individual feeding amblyomma americanum female ticks. | 1985 | 4093818 | |
| resistance to ixodid tick infestation induced by administration of tick-tissue culture cells. | primary tissue culture cells of developing larvae of amblyomma americanum were administered to guinea-pigs never previously exposed to ixodid ticks. guinea-pigs were given 1 x 10(6) primary culture cells on days 0, 7 and 21 by subcutaneous injection and challenged with male and female a. americanum on day 35. a significant degree of induced host tick resistance was expressed by reduced engorgement weight of females, reduced oviposition by those females which did obtain a blood meal, and by death ... | 1985 | 4083961 |
| injury thresholds and production loss functions for the lone star tick, amblyomma americanum (acari: ixodidae), on pastured, preweaner beef cattle, bos taurus. | 1985 | 4056195 | |
| density estimators for populations of the lone star tick, amblyomma americanum (acari: ixodidae), on pastured beef cattle. | 1985 | 4009621 | |
| human infestation by amblyomma americanum larvae ("seed ticks"). | 1985 | 4002011 | |
| evaluation of five popular methods for tick removal. | five methods commonly advocated for tick removal from a human or domestic animal were evaluated. the application of petroleum jelly, fingernail polish, 70% isopropyl alcohol, or a hot kitchen match failed to induce detachment of adult american dog ticks (dermacentor variabilis say) attached for either 12 to 15 hours or three to four days. use of forceps or protected fingers enabled satisfactory removal of 29 adult american dog ticks without leaving the mouthparts or attachment cement in the host ... | 1985 | 4000801 |
| acquisition and expression of resistance by bos indicus and bos indicus x bos taurus calves to amblyomma americanum infestation. | purebred and crossbred bos indicus calves were infested 1, 2, or 3 times with 10 female and 5 male amblyomma americanum. resistance was acquired by both the purebred and the crossbred calves after 1 infestation and resulted in statistically significant decreases in the percentages of females that engorged, the mean weights of engorged females, and the mean weights of egg masses. comparisons between breeds of the percent of female ticks that engorged during the first and second infestations indic ... | 1985 | 3998956 |
| surveillance of lyme disease in the united states, 1982. | lyme disease is a tick-borne illness that has been reported from three regions in the united states--the northeast, midwest, and west--which correspond to the distribution of the recognized vectors of the disease, ixodes dammini and ixodes pacificus. in 1982, a surveillance system designed to define the morbidity and geographic distribution for lyme disease by using a clinical case definition received information on 491 definite cases and 38 probable cases. of the definite cases, 489 were acquir ... | 1985 | 3998509 |
| apparatus for artificial infestation of pastured beef cattle with the lone star tick (acari: ixodidae). | 1985 | 3998270 | |
| field method for evaluating the effectiveness of acaricides against lone star ticks (acari: ixodidae) on domestic dogs. | 1985 | 3973208 | |
| amblyomma americanum: requirement for host fc receptors in antibody-mediated acquired immune resistance to ticks. | guinea pig recipients of anti-tick immune serum or immune peritoneal exudate cells expressed 25 and 30% tick rejection, respectively, when challenged with amblyomma americanum larval ticks. previous studies have shown that igg1 antibodies are responsible for the ability of immune serum to transfer resistance to ticks and to mediate the accompanying, and required, cutaneous basophil response. since igg1 antibodies induce mast cell-mediated passive cutaneous anaphylaxis and cutaneous basophil resp ... | 1985 | 3972060 |
| intradermal infestation of a red fox (vulpes vulpes) by the lone star tick (amblyomma americanum). | 1986 | 3951048 | |
| production system-based model for defining economic thresholds in preweaner beef cattle, bos taurus, infested with the lone star tick, amblyomma americanum (acari: ixodidae). | 1986 | 3950186 | |
| density perturbation in populations of amblyomma americanum (acari: ixodidae) in beef cattle forage areas in response to two regimens of vegetation management. | 1986 | 3950182 | |
| rickettsia-like organisms in ticks and antibodies to spotted fever-group rickettsiae in mammals from northern mississippi. | studies were conducted from april through august during 1974 and 1975 on 30 randomly selected trapping sites in wall doxey state park, holly springs national forest, and 1.6 km south of the park in marshall county, mississippi to provide information on the occurrence of ticks involved in the maintenance and transmission of spotted fever-group rickettsiae in nature. of 365 animals (14 species) collected, 186 (51%) were parasitized by 4,169 ticks. species of ticks collected included: dermacentor v ... | 1985 | 3923212 |
| systemic activity of closantel for control of lone star ticks, amblyomma americanum (l.), on cattle. | cattle were treated once at 5 mg/kg orally or subcutaneously or daily at 0.1-5 mg/kg orally or 0.1-1 mg/kg subcutaneously with closantel, n-[5-chloro-4-[(4-chlorophenyl)cyanomethyl]-2-methylphenyl]-2-hydroxy-3, 5-diiodobenzamide, and numbers and weights of engorged females, weights of egg masses and hatch of eggs of lone star ticks, amblyomma americanum, were recorded. effectiveness of treatments on reproduction was determined by comparing total estimated larvae (el) (el = wt. egg mass x est. % ... | 1985 | 3870959 |
| survival of the lone star tick (acari: ixodidae) under flooding conditions: a laboratory evaluation. | 1986 | 3805482 | |
| spotted fever group rickettsiae in the lone star tick, amblyomma americanum (acari: ixodidae). | 1986 | 3772952 | |
| electrophoretically detectable protein variation in natural populations of the lone star tick, amblyomma americanum (acari: ixodidae). | nine populations of amblyomma americanum (l.) were examined electrophoretically for variation of 21 enzymes. only three enzymes were not polymorphic and the average heterozygosity per individual (h) for the species was 0.085 with a range of 0.077 to 0.110, comparing well with values in other arthropods. the average nei identity value for pairwise comparisons among the nine populations was high, 0.994 +/- 0.004 (i +/- sd). these high identity values and the absence of geographic structuring of th ... | 1986 | 3744877 |
| physiological and biochemical changes in unfed lone star ticks, amblyomma americanum (acari: ixodidae), with increasing age. | 1986 | 3735326 | |
| serum basophil-stimulating activity in the guinea-pig during induction of basophilic responses to ovalbumin and tick feeding. | we have described functional and biochemical characteristics of a distinct t-cell dependent guinea-pig basophil-stimulating factor (bsf), measured using a sensitive 7-day bone marrow culture assay, standardized with high-activity bsf present in serum-free splenic cell-conditioned medium (cm). in the present studies, the in vivo relevance of bsf was explored during protocols of induction of peripheral blood or tissue basophil responses to ovalbumin (oa) injection or amblyomma americanum tick feed ... | 1986 | 3733145 |
| influence of deer exclusion on populations of lone star ticks and american dog ticks (acari: ixodidae). | 1986 | 3722591 | |
| amblyomma americanum: physiochemical isolation of a protein derived from the tick salivary gland that is capable of inducing immune resistance in guinea pigs. | crude salivary gland derived proteins from amblyomma americanum ticks were analyzed by physiochemical (gel filtration and ion exchange chromatography) and immunochemical guinea pig igg1 (anti-tick immunoaffinity column) techniques for the presence of antigens responsible for the induction of host immune resistance responses. gel filtration (g-75 sephadex) and ion exchange (diethyl aminoethyl cellulose) chromatography of crude salivary gland antigen yielded multiple fractions, but only one fracti ... | 1986 | 3720900 |
| computer simulation of area-wide management strategies for the lone star tick, amblyomma americanum (acari: ixodidae). | 1987 | 3669024 | |
| the development of amblyomma americanum and dermacentor variabilis (acari: ixodidae) fed on rabbits immunized with tick hemolymph. | the possibility of interfering with the normal function of tick hemolymph using antihemolymph antibodies taken in with the bloodmeal, was investigated. cell free hemolymph from replete amblyomma americanum and dermacentor variabilis ticks was used to immunize rabbits. immunized rabbits developed high antihemolymph antibody titers (ca. 10(5)) and had no ill side effects. rabbits were simultaneously infested with larvae, nymphs, and adult ticks. the biological performance of ticks fed on immunized ... | 1987 | 3588587 |
| effects of season and area on ectoparasites of white-tailed deer (odocoileus virginianus) in mississippi. | nine species of ectoparasites (4 acari, 2 mallophaga, 1 anoplura, 1 diptera, and 1 siphonaptera) were recovered from 126 white-tailed deer collected in northern, central, and southern mississippi. intensity and prevalence of adults of ixodes scapularis and larvae, nymphs, and adults of amblyomma americanum varied significantly over collection periods, but not between host sexes. lipoptena mazamae occurred on deer from only one study area. although individual deer were heavily parasitized by tric ... | 1987 | 3586204 |
| computer simulation of population dynamics of the lone star tick, amblyomma americanum (acari: ixodidae). | 1987 | 3585931 | |
| effects of gamma radiation on spermatogenesis and fertility of male amblyomma americanum (acari: ixodidae). | amblyomma americanum males were treated with 0.5, 1, 2, 3, 4, 8, and 16 krad of gamma radiation. testes of ticks treated with 2, 3, 4, 8, and 16 krad were smaller than those of ticks irradiated at lower levels and controls. no recognizable alteration in timing of spermatogenesis was noted among the different radiation groups, but severe breakdown and depletion of germinal cells was noted at 4, 8, and 16 krad. percent hatch of larvae from crosses of irradiated males and untreated females decrease ... | 1987 | 3585625 |
| estimation and economic implications of lone star tick (acari: ixodidae) infestation on weight gain of cattle, bos taurus and bos taurus x bos indicus. | 1987 | 3584640 | |
| comparison of rates of infection by the lyme disease spirochete in selected populations of ixodes dammini and amblyomma americanum (acari: ixodidae). | at a major endemic focus in new jersey, 50% of 290 adult ixodes dammini collected in the fall of 1984 were infected with the lyme disease spirochete (borrelia burgdorferi), which was statistically higher than the rate found in the 202 adult ticks (39.6%) examined during the spring. neither sex nor site of collection within the focus significantly affected the infection rate. the observed infection rates were similar to those reported in endemic areas of new york and connecticut. borrelia burgdor ... | 1986 | 3577494 |
| a seed tick infestation of the conjunctiva: amblyomma americanum larva. | ticks commonly infest humans but rarely bite the eyes. they are vectors of disease; therefore, rapid and complete removal is important. their attachment can be so secure that removal is difficult or hazardous. we excised a larval form of amblyomma americanum from a woodsman's conjunctiva. | 1987 | 3566026 |
| spirochetes in ticks and antibodies to borrelia burgdorferi in white-tailed deer from connecticut, new york state, and north carolina. | ticks were screened for spirochetes and serum samples from white-tailed deer (odocoileus virginianus) were assayed for antibodies to borrelia burgdorferi during 1983-1984. using fluorescein isothiocyanate-labeled rabbit antibodies produced to b. burgdorferi, the etiologic agent of lyme disease, spirochetes were detected in ixodes dammini (10.5% of 1,193) and dermacentor albipictus (0.6% of 157) adults from connecticut, i. dammini nymphs (49.1% of 108) and adults (64.7% of 99) from armonk, new yo ... | 1986 | 3520030 |
| the effect of avermectins on feeding, salivary fluid secretion, and fecundity in some ixodid ticks. | we tested the effects of the potent acaricides, avermectin b1a (avm) and 22,23-dihydroavermectin b1 (ivermectin; ivm) when injected directly into partially fed and fully engorged female ticks. when injected into small ticks (amblyomma hebraeum koch), neither drug (up to 100 micrograms/kg b.w.) inhibited subsequent engorgement nor affected oviposition latency, weight of total egg mass laid nor viability of laid eggs. at higher concentrations (1000 and 5000 micrograms/kg b.w.), avm and ivm were ma ... | 1986 | 3451859 |
| evidence for regurgitation by amblyomma americanum. | western blot analysis of amblyomma americanum-derived midgut extracts using tick-resistant rabbit and guinea pig antisera demonstrated several unique polypeptides ranging from 7 to 355 kda. these polypeptides were not observed in similar blots of salivary gland extracts or serum from the respective host animals. the data from this study suggest that female a. americanum ticks regurgitate gut material during feeding. such a finding explains the ability of immunization with gut-derived preparation ... | 1988 | 3420794 |
| abundance, attachment sites, and density estimators of lone star ticks (acari: ixodidae) infesting white-tailed deer. | 1988 | 3404547 | |
| seasonal changes in feeding on cattle and reproduction by amblyomma americanum (acari: ixodidae) under field conditions. | 1988 | 3357171 | |
| lone star tick (acari: ixodidae) management by host manipulation through habitat modification. | 1988 | 3351876 | |
| role of small mammals in population dynamics and dissemination of amblyomma americanum and dermacentor variabilis (acari: ixodidae) at land between the lakes, tennessee. | 1987 | 3295243 | |
| characterization of tick antigens inducing host immune resistance. ii. description of rabbit-acquired immunity to amblyomma americanum ticks and identification of potential tick antigens by western blot analysis. | feeding by adult amblyomma americanum ticks induced a level of immunity in rabbits to subsequent tick feeding that resulted in a significant decrease in tick feeding success and fecundity. histological analysis of tick feeding sites in hosts expressing resistance revealed a predominant eosinophil response, with weak basophil and neutrophil infiltrates. while the basophil was never the dominant granulocyte at the tick feeding sites in resistant hosts, this cell exhibited the greatest increase in ... | 1988 | 3291384 |
| effects of photoperiod on nymphal diapause in amblyomma americanum (acari: ixodidae). | 1988 | 3204627 | |
| medium-sized mammal hosts of amblyomma americanum and dermacentor variabilis (acari: ixodidae) at land between the lakes, tennessee, and effects of integrated tick management on host infestations. | 1988 | 3204625 | |
| susceptibility of amblyomma americanum to natural and experimental infections with theileria cervi. | one hundred fifty amblyomma americanum were examined between march and september 1986 from cookson hills wildlife refuge in eastern oklahoma (usa). of these ticks, 11% (17 of 150) were infected with theileria cervi. field-collected nymphal ticks had an 8% (3 of 37) prevalence of infection averaging 1.0 infected acini/nymph. female ticks had a 16% prevalence of infection averaging 1.6 infected acini/female; t. cervi was not observed in salivary glands of field-collected male ticks. when laborator ... | 1988 | 3193564 |
| ability to ixodes scapularis, dermacentor variabilis, and amblyomma americanum (acari: ixodidae) to acquire, maintain, and transmit lyme disease spirochetes (borrelia burgdorferi). | 1988 | 3193425 | |
| ticks parasitizing humans in a lyme disease endemic area of southern new york state. | a total of 126 tick specimens were submitted by tick bite victims to the westchester county department of health, white plains, new york, and to the new york medical college, medical entomology laboratory, armonk, new york, during 1985. these included 96 (76.2%) ixodes dammini, 26 (20.6%) dermacentor variabilis, and two (1.6%) amblyomma americanum. i. dammini parasitism was reported during all months of the year except december and february and involved all life stages. only d. variabilis adults ... | 1988 | 3189288 |
| the ultrastructure of sporogony in theileria cervi (bettencourt et al., 1907) in salivary glands of female amblyomma americanum (l.) ticks. | the process of sporogony of theileria cervi in salivary glands of unfed and feeding amblyomma americanum females that were infected as nymphs was studied by light and electron microscopy (sem and tem). sporogony was observed only in granular acini type iii and in cells classified as complex granular. infected acini in salivary glands of both unfed and feeding ticks were enlarged. some stages of parasite development were evident with light microscopy and sem, but the specific events of sporogony ... | 1987 | 3125313 |
| failure to detect infection in fallow deer (cervus dama) exposed to theileria cervi from white-tailed deer. | a frozen stabilate was produced from theileria cervi sporozoites in salivary glands of adult amblyomma americanum. the stabilate was inoculated into three fallow deer (cervus dama) and two white-tailed deer (odocoileus virginianus). following inoculation, the white-tailed deer developed parasitemias as determined by blood smear examination at 11 and 13 days postexposure. repeat examination of blood from the three fallow deer for 30 days postexposure failed to reveal observable piro-plasms. these ... | 1987 | 3119873 |
| effect of age on cholinesterase activity and protein of unfed larval ticks. | the cholinesterase (ache) activity and total protein in homogenates of unfed larvae of amblyomma americanum (l.), a. cajennense (fabricius), a. maculatum koch, anocentor nitens neumann, and boophilus microplus (canestrini) were determined weekly in ticks 1-6 wk of age. there was a considerable variation in total protein, ache, and the ratio of ache to protein as the ticks aged. however, ache activities were constant or increased with age and total protein levels were constant or decreased. no di ... | 1989 | 2918444 |
| comparison of flagging, walking, trapping, and collecting from hosts as sampling methods for northern deer ticks, ixodes dammini, and lone-star ticks, amblyomma americanum (acari:ixodidae). | ticks were sampled by flagging, collecting from the investigator's clothing (walking samples), trapping with dry-ice bait, and collecting from mammal hosts on fire island, ny, u.s.a. the habitat distribution of adult deer ticks, ixodes dammini, was the same in simultaneous collections from the investigator's clothing and from muslin flags. walking and flagging samples can both be biased by differences between investigators, so the same person should do comparative samples whenever possible. walk ... | 1989 | 2806016 |
| reduction of the amblyomma americanum (acari: ixodidae) population at fort a.p. hill, virginia, by aerial application of diazinon granules: correlation of percentage control with received dose. | habitat (280 ha) of lone star tick, amblyomma americanum (l.), was aerially treated with 14% diazinon granules. concentration of acaricide reaching the forest floor ranged from 0.02 to 1.25 kg (ai)/ha. greater than 85% control was achieved at study plots receiving the highest dose. a positive correlation was shown between dose received at the forest floor and percentage of control of adults (r = 0.91) and nymphs (r = 0.86). | 1989 | 2795622 |
| female mediation of feeding time on cattle in adult lone star ticks (acari: ixodidae). | the extended feeding time response on cattle of adult lone star ticks, amblyomma americanum (l.), during november through december is facultative and is mediated by the female. mean feeding time (11.8 d) in female ticks taken from the field and held at 14:10 (l:d) photoperiod and 25 degrees c for greater than or equal to 15 d was significantly shorter (p = 0.05) than for females taken directly from the field and fed on cattle (14.6 d). mean feeding times of females from the field paired to males ... | 1989 | 2769719 |
| polyfluoro 1,3-diketones as systemic insecticides. | a series of aryl polyfluoro 1,3-diketones were examined for systemic ectoparasiticidal activity in cattle. the compounds demonstrated efficacy against several economically important species of insects and acarina. at dosages of 5 mg/kg x1 or 0.35 mg/kg per day intraruminally, activity was observed against blowfly larvae (phormia regina), adult stable fly (stomoxys calcitrans), and lone star tick (amblyomma americanum). in vivo activity was not directly related to in vitro activity, showing a str ... | 1989 | 2769686 |
| characterization of ixodid tick salivary-gland gene products, using recombinant dna technology. | ticks secrete an array of lesion-maintenance factors into the host via the salivary glands while feeding, some of which elicit an immune response by the host that adversely affects the ability of the tick to feed and reproduce. our approach to characterizing these factors has been to make expression libraries from mrna of salivary glands (from unfed and 3-day-feeding amblyomma americanum females) which will serve as sources of the genes (clones) that code for them. thus far, we have detected 10 ... | 1989 | 2758938 |
| habitat use by cattle affects host contact with lone star ticks (acari: ixodidae). | the location of zebu, british, and zebu x british cattle in tick-infested plots from march through september 1986 was compared with the location of amblyomma americanum l. in the same plots. in april, may, and june, zebu cattle spent less time (9.3-19.4%) in tick-infested quadrats than british (44.4-63.9%) or zebu-british (49.0-69.3%) cattle. in the same months, the probability that a. americanum would contact zebu cattle (1.5-19.6%) was significantly lower than for british (34.7-41.7%) or zebu- ... | 1989 | 2754101 |
| sites of attachment and density assessment in amblyomma americanum (acari: ixodidae) on nursing beef calves. | primary attachment sites of male, female, and nymphal amblyomma americanum (l.) on nursing beef calves were the axillary, inguinal and perianal areas of the body. about 50% of all larvae fed on the ears. a density assessment method which uses the number of a. americanum on less than or equal to 5 body areas to predict the total number of ticks (tick burden) on the left side of a calf is presented. estimates of tick burden for male, female, nymphal and larval a. americanum each require examinatio ... | 1989 | 2714123 |
| control of lone star ticks (acari: ixodidae) on spanish goats and white-tailed deer with orally administered ivermectin. | ivermectin administered orally to spanish goats, capra hircus (l.), or to white-tailed deer, odocoileus virginianus (zimmerman), was highly effective against lone star ticks, amblyomma americanum (l.). for spanish goats, daily oral doses of 20 micrograms/kg resulted in greater than or equal to 2 ppb ivermectin in the blood. this level was sufficient to cause greater than 95% reduction of estimated larvae from feeding ticks. a bioassay with horn flies, haematobia irritans (l.), was developed to e ... | 1989 | 2607030 |
| rejection of ticks from guinea pigs by anti-hapten-antibody-mediated degranulation of basophils at cutaneous basophil hypersensitivity sites: role of mediators other than histamine. | previous studies have established that recruitment of basophils to sites of tick feeding in guinea pigs is required to effect immune resistance. in the current study, actively sensitized guinea pigs treated three times daily with h-1 (mepyramine) and h-2 (cimetidine) histamine receptor antagonists, during the challenge tick infestation period, expressed normal resistance to amblyomma americanum larvae. similarly, naive guinea pigs treated with anti-histamines four times daily, beginning 7 days b ... | 1985 | 2578152 |
| experimental infection of six species of ixodid ticks with dugbe virus (family bunyaviridae, genus nairovirus). | the vector potential of each of 6 species of colonized north american and african ixodid ticks was assessed by intracoelomic inoculation with dugbe virus (ibar 1792, 14th passage in suckling mouse brain) and viral titers were monitored after selected incubation periods. persistence of dugbe virus for greater than or equal to 53 days in 5 species (dermacentor andersoni, d. variabilis, amblyomma americanum, rhipicephalus appendiculatus, and r. sanguineus) indicates that infection occurred. viral t ... | 1989 | 2496609 |
| western blot analysis of amblyomma americanum-derived stage-specific and shared antigens using serum from guinea pigs expressing resistance. | serum from guinea pigs expressing resistance to larval, nymphal and adult amblyomma americanum ticks was used in western blot analyses to identify potential antigens from egg, larval and nymphal, and female salivary gland extract preparations. the results demonstrate multiple antigens unique to each life stage, as well as several shared proteins between the three life stages. however, it appears as if two particular proteins of 25 and 38 kda may be more important than others, based upon their pr ... | 1988 | 2455376 |
| intrinsic competence of three ixodid ticks (acari) as vectors of the lyme disease spirochete. | we compared the intrinsic vector competence of ixodes dammini spielman et al., dermacentor variabilis (say), and amblyomma americanum (l.) for the lyme disease spirochete (borrelia burgdorferi johnson et al.) on prudence island, rhode island, a lyme disease-endemic site where all three ticks occur together. natural and experimental spirochete infection rates were determined in those ticks and their degree of contact with white-footed mice (peromyscus leucopus), the principal reservoir host, was ... | 1990 | 2388239 |
| effects of sequential infestations of dermacentor albipictus and amblyomma americanum (acari: ixodidae) on overwintering beef cows in west-central texas. | infestations of winter ticks, dermacentor albipictus (packard), observed on mature black angus cows, reached peak levels in january and diminished through march. infestations of adult lone star ticks, amblyomma americanum (l.), began in mid-january and increased through may. cows receiving ectrin, taktic, or deltox treatments on 13 december and 21 february experienced significantly less weight loss and entered the subsequent breeding season with higher average body weight than untreated cows. in ... | 1990 | 2388237 |
| ectoparasitic and phoretic arthropods of virginia opossums (didelphis virginiana) in central tennessee. | thirteen species of ectoparasitic (12) or phoretic (1) arthropods were collected from 26 adult virginia opossums, didelphis virginiana, live-trapped from april through september 1987 in davidson county, tennessee. the cat flea ctenocephalides felis and the american dog tick dermacentor variabilis were the predominant species with respect to mean intensity and prevalence. the macronyssid mite ornithonyssus wernecki and the atopomelid mite didelphilichus serrifer, both specific parasites of this h ... | 1990 | 2380870 |
| rickettsia in texas. | since the first reported case in 1941, rocky mountain spotted fever in humans has been reported from many areas of texas, with two major foci, one located in the north-central region and the other in the eastern region of the state. during the period 1979-1988, 421 cases of rmsf were reported, reaching 108 cases in 1983 and declining in subsequent years. statewide surveillance programs to detect spotted fever group rickettsiae in tick populations were initiated in 1976. in recent years, the sfg ... | 1990 | 2378448 |
| experimental transmission of a granulocytic form of the tribe ehrlichieae by dermacentor variabilis and amblyomma americanum to dogs. | transstadial transmission of granulocytic ehrlichieae in dogs was attempted using ticks, amblyomma americanum and dermacentor variabilis. ticks were exposed by feeding as nymphs on acutely infected pups; adult ticks then fed to repletion on susceptible adult dogs that were monitored daily for signs of infection. evidence of transmission was not observed in control dogs or in those exposed to d variabilis. in contrast, dogs exposed to a americanum developed serologic or clinical evidence of infec ... | 1990 | 2368951 |