PMID(sorted descending)
amblyomma americanum: a potential vector of lyme disease in new jersey.amblyomma americanum is a likely secondary vector of lyme disease in new jersey. ticks of this species were removed from the site of the characteristic skin lesion known as erythema chronicum migrans on two patients with the disease, and the lyme disease spirochete was isolated from nymphs and adults of this species. that a. americanum is a potential vector is supported by its similarities to ixodes dammini, the known tick vector, in seasonal distribution and host utilization. the extensive rang ...19846710158
effect of host age on the expression of acquired resistance to ticks.young guinea-pigs (350 g) expressed significantly greater levels of acquired resistance to challenge by larval amblyomma americanum ticks than older guinea-pigs (520-800 g). this finding suggests that younger guinea-pigs are immunologically more responsive to tick infestation than older mature individuals. therefore, host age is an important variable in evaluating acquired resistance to ticks.19846698176
colonization and life cycle of amblyomma variegatum (acari: ixodidae) in the laboratory in puerto rico. 19846694178
pheromone-induced aggregation of ixodid ticks before host contact.the presence of a pre-feeding aggregation pheromone was demonstrated in the species dermacentor variabilis, dermacentor andersoni, dermacentor parumapertus, amblyomma americanum and haemaphysalis leporispalustris by assay within a petri dish. however, amblyomma maculatum and amblyomma cajennense did not aggregate in the sector containing discs of presumed pheromone within the hour period. d. andersoni and a. americanum recognized each other's pheromone and a. americanum recognized that of h. lep ...19836683667
some helminth and arthropod parasites of the grey duiker, sylvicapra grimmia.sixteen grey duikers were culled on the farm riekert 's laager in the central transvaal at irregular intervals from may 1979-march 1981. one trematode species, 3 cestode species and 16 nematode species were recovered from these animals. of these the following are new helminth records for this antelope: cooperia hungi , cooperia neitzi , cooperia pectinata , trichostrongylus axei, trichostrongylus colubriformis, trichostrongylus falculatus , trichostrongylus instabilis , impalaia tuberculata , ne ...19836676685
a bioassay technique for the pheromone emitted by amblyomma hebraeum males.attachment of amblyomma hebraeum females, either around feeding males or in areas in which extracts of fed males had previously been placed, was studied. the percentage attachment of female ticks around feeding males was significantly higher than that inside extract-treated areas. it was also found that the percentage attachment around the males increases with time, but there is little or no increase in attachment with time inside the treated areas. the amount of pheromone released by 1 feeding ...19836634086
copulation and successful insemination by unfed amblyomma triguttatum triguttatum koch. 19836631646
bovine resistance to amblyomma americanum ticks: an acquired immune response characterized by cutaneous basophil infiltrates.purebred holstein calves acquired resistance to amblyomma americanum adult ticks after 1 infestation and expressed resistance during a challenge infestation 26 days later. tick yields from resistant animals were normal, but mean tick weight and egg-mass weight were reduced significantly (31 and 32%, respectively). cutaneous cellular responses at tick feeding sites in primary (naive) hosts consisted almost exclusively of mononuclear cells, until 24-h post-infestation when granulocytes appeared. a ...19846543047
seasonal pattern of tick load in bunaji cattle in the subhumid zone of nigeria.the seasonal pattern of tick load on bunaji cattle under traditional management in northern nigeria was observed over 12 months to investigate the possibilities of strategic use of acaricide. ticks were removed 2-3 times weekly by hand from 16 animals, counted and the species determined. tick load was low in the dry season (2-5 ticks per animal per week), increased after the onset of the first scattered rains, reached a peak (40 ticks per animal per week) 1 month after the beginning of the heavy ...19846541842
studies on ticks of veterinary importance in nigeria. xi. observations on the biology of ticks detached from the red-flanked duiker (cephamophys rufulatus) and parasites encountered in their blood.some aspects of the biology of amblyomma variegatum and boophilus decorolatus detached from red-flanked duikers were studied. smears were also made from the blood of the duikers and examined for the presence of parasites. anaplasma marginale was the only blood parasite found in the blood smears. compared with ticks detached from cattle, duiker ticks produced a greater number of eggs. the lengths and breadths of eggs produced by duiker ticks were greater than those of cattle ticks and unlike a. v ...19846538723
[a new species of tick for madagascar, amblyomma loculosum, neumann 1907]. 19846534289
records of the bont tick, amblyomma hebraeum, from the angulate tortoise, chersina angulata, and the leopard tortoise, geochelone pardalis.a. hebraeum nymphae were found on 4 angulate tortoises and 13 leopard tortoises in the addo elephant national park, eastern cape province. adults of this species were collected for the 1st time from a leopard tortoise in the mkuze game reserve, natal. the significance of this finding, in relation to the normal host preferences of this tick, is briefly discussed.19846533508
ticks on white-tailed deer fawns from southern illinois.seventy-six white-tailed deer (odocoileus virginianus (zimmermann] fawns captured on crab orchard national wildlife refuge in southern illinois during june-july 1980-1983 were aged and examined for ticks. the prevalence of ticks (amblyomma americanum (linnaeus, 1758) and dermacentor variabilis (say, 1821] was 80%; intensity of infestation ranged from one to 123 ticks per fawn, averaging 21.6. tick intensity correlated poorly with age suggesting that there were other, more important determinants ...19846530716
studies on ticks of veterinary importance in nigeria xvii. resistance of rabbits to infestation with amblyomma variegatum and boophilus decoloratus (acari: ixodidae).rabbits exposed to larvae, nymphs and adults of amblyomma variegatum acquired resistance to the infestation with adults of this tick. the degree of acquired resistance was lowest in the rabbits exposed once previously to larvae and highest in those exposed twice previously to adults. rabbits also acquired resistance after primary infestation with boophilus decoloratus; their resistance became very high during the thrice-repeated feeding. new terms are introduced for the quantification of the deg ...19846510837
characterization of tick antigens inducing host immune resistance. i. immunization of guinea pigs with amblyomma americanum-derived salivary gland extracts and identification of an important salivary gland protein antigen with guinea pig anti-tick antibodies.guinea pigs immunized by subcutaneous injection of an emulsion of incomplete freund's adjuvant (ifa) containing tick salivary gland extract antigens (sga) from partially fed female ticks expressed a significant level of tick rejection when challenged 17 days later. this level of tick rejection was similar to animals actively sensitized by tick feeding and challenged at the same time. sga emulsified with complete freund's adjuvant (cfa) or administered with saline was ineffective. however, ticks ...19846491289
theileria mutans infection in nigerian a 12 year survey in the former northern provinces of nigeria antibodies to theileria mutans were found to have a prevalence rate of 32.6 to 85%. the indirect fluorescent antibody test was found to be more efficient than thin blood smear examination in detecting cattle exposed to t. mutans. the high prevalence of t. mutans infection was attributed to the high prevalence of amblyomma species in the area under study.19846435298
isolation and transmission of theileria mutans (chisamba) in zambia.theileria mutans (chisamba) was isolated from a steer at chisamba, central province, zambia by inoculation of blood into a susceptible unsplenectomised calf. the parasite was then transmitted on three occasions by nymphs and once by adult amblyomma variegatum ticks. macroschizonts, typical for t mutans, were detected in two calves for short periods. the parasite caused varying degrees of anaemia in all experimental calves, whose sera showed high antibody titres to t mutans in the indirect fluore ...19846424195
[recent advances in the study of the vector role of ticks of the genus amblyomma (ixodidae)]. 19836417741
immunohistochemical localization of adenosine 3':5'-cyclic monophosphate in female ixodid tick amblyomma americanum (l.) salivary glands.localization of adenosine 3':5'-cyclic monophosphate (cyclic amp) in alveoli of salivary glands of female amblyomma americanum (l.) was accomplished with an indirect immunofluorescent technique. little cyclic amp fluorescence was seen in type i alveoli in glands of unfed females but considerable fluorescence was seen in type i alveoli of glands obtained from females that had fed. the most intense cyclic amp fluorescence was observed in complex granular cells of type ii and iii alveoli in glands ...19836298395
potentiation by spiperone and other butyrophenones of fluid secretion by isolated salivary glands of ixodid ticks.isolated salivary glands from the ixodid tick, amblyomma hebraeum koch are stimulated to secrete fluid when exposed to dopamine (da), the maximum response occurring at 10(-6) m. spiperone, and a number of other butyrophenone derivatives, although lacking intrinsic activity, are able to potentiate the secretion elicited by supramaximal concentrations of da; this potentiation by spiperone is evident at concentrations in the femtomolar range. tranylcypromine, a potent, competitive inhibitor of mono ...19816273183
properties of na, k-atpase from the salivary glands of the ixodid tick amblyomma hebraeum. 19806253039
evidence for multiple receptors mediating fluid secretion in salivary glands of ticks.using isolated salivary glands of the ixodid tick amblyomma hebraeum koch, we tested the effectiveness of butaclamol and sulpiride in blocking fluid secretion stimulated by a number of agonists. (+)-butaclamol was a potent inhibitor of dopamine, n-methyldopamine and noradrenaline (ki congruent to 30-60 nm), but was less effective on ergometrine (ki congruent to 310 nm). tranylcypromine-stimulated fluid secretion in the absence and presence of (+)-butaclamol and (+/-)-sulpiride suggested that tra ...19836188618
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).19846149877
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. ...19826125338
[amblyomma chabaudi rageau, 1964 (ixodidae). breeding in the laboratory. description of the larva. complementary observations on the nymph]. 19676062855
[isolation of a strain of rickettsia conori from larvae of amblyomma variegatum in guadeloupe]. 19666013770
[isolation of toxoplasma gondii in naturally infected ixodidae of the genus amblyomma]. 19655892111
[amblyomma chabaudi rageau, 1964. (ixodidae). description of the female and the nymph. morphologic variations of the male]. 19655864221
white-tailed deer, a new host for amblyomma inornatum. 19695816091
arbovirus studies in the ohio-mississippi basin, 1964-1967. vii. lone star virus, a hitherto unknown agent isolated from the tick amblyomma americanum (linn). 19695810802
eradication efforts against tropical bont tick, amblyomma variegatum, in the virgin islands. 19695766830
field vector studies of epizootic east coast fever. vi. the occurrence of amblyomma variegatum and a. lepidum in the east coast fever zones. 19685750916
ticks in the south african zoological survey collection. 13. gynanders of boophilus decoloratus (koch, 1844) and amblyomma hebraeum koch, 1844. 19675586994
fine structure of tarsal sensilla in the tick amblyomma americanum (l.). 19715541841
[contribution to a study of the ticks of senegal (acarina, ixodoidea). i. larvae of amblyomma (koch) and hyalomma (koch)]. 19705508156
amblyomma (acarina: ixodidae) on white-tailed deer, odocoileus virginianus (zimmermann), from south texas with implications for theileriasis. 19705501217
mating behavior and reproduction of the lone star tick, amblyomma americanum. 19705449398
effect of age on the attachment rate of the parasitic stages of the lone star tick, amblyomma americanum (linnaeus) (acarina: ixodidae), in the laboratory. 19705435814
a new species of amblyomma from iguanas in the caribbean (acarina: ixodidae). 19695391156
[the tick amblyomma testudinis (conil 1877): its development and effect on the host]. 19695380272
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 ...19695306621
engorgement and reproduction of lone star ticks (amblyomma americanum (l.)) treated with gamma-radiation. 19665296972
response of ovipositing amblyomma maculatum koch (acarina: ixodidae) to photoperiod. 19715160257
the ecology of the lone star tick, amblyomma americanum (l.), in two contrasting habitats in virginia (acarina: ixodidae). 19715153583
[notes on the ticks of sicily, with descriptions of hyalomma detritum and amblyomma variegatum]. 19715147924
bionomics of the gopher tortoise tick, amblyomma tuberculatum marx. 19725057497
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.19725054146
fine structural analysis of palpal receptors in the tick amblyomma americanum(l.). 19725042252
a method of collecting nymphal and adult lone star ticks, amblyomma americanum (l.) (acarina: ixodidae), from woodlots. 19725036200
redescription of amblyomma fulvum neumann 1899 (acarina: ixodidae), a parasite of the giant anaconda in northern south america. 19725036198
mate-seeking by female amblyomma maculatum (acarina: ixodidae) on a bovine. 19714938838
[amblyomma variegatum of african or antillean origin and rickettsia of the dermacentroxenus genus]. 19694933938
fine structure of the central nervous system of dermacentor variabilis (say), amblyomma americanum (l.), and argas arboreus kaiser, hoogstraal, and kohls (ixodoidea). 19744852052
the effect of immersion in water on the immature stages of the ixodid ticks-rhipicephalus appendiculatus neumann 1901 and amblyomma variegatum fabricius 1794. 19734787718
the ecology of amblyomma cajennense a parasite of man and animals in trinidad. 19734777424
permeability of tarsal sensilla in the tick amblyomma americanum l. (acarina, ixodidae). 19724647364
some experiments on the transmission of theileria mutans (theiler, 1906) and theileria parva (theiler, 1904) by the ticks amblyomma variegatum (fabricius, 1794) and rhipicephalus appendiculatus neumann, 1901, in uganda. 19744607395
resistance of purebred brahman, hereford, and brahman times hereford crossbred cattle to the lone star tick, amblyomma americanum (acarina: ixodidae). 19744455918
ultrastructure of haller's organ in the tick amblyomma americanum (l.). 19724334800
[detection of amblyomma gemma dön. (ixodidae) in the crimea]. 19724271864
a search for the epidemic typhus agent in ethiopian ticks.the presence of antibodies to rickettsia prowazeki in domestic animals from several parts of africa, and the isolation of this rickettsia from the blood of goats and sheep and from ticks off cattle or camels in ethiopia, led to the hypothesis that r. prowazeki in nature may occur in an extrahuman cycle involving ticks and domestic animals. this study attempted to recover r. prowazeki from 2 624 ticks (4 genera, 10 species) collected in central and southern ethiopia. the ticks were examined by th ...19734204491
weight changes in individual feeding amblyomma americanum female ticks. 19854093818
ticks on livestock in st. lucia.cattle, sheep, goats and horses were examined for ticks. over 95% of holstein cross-breeds, 28% of sheep (local mixed breeds) and 18% of goats (local mixed breeds) examined from 18 august to 4 september 1983 were infested with the southern cattle tick, boophilus microplus canestrini. about 90 and 17% of the horses examined were infested with the tropical horse tick, anocentor nitens neumann, and the tropical bont tick, amblyomma variegatum fabricius, respectively. the tropical bont tick was foun ...19854090245
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 ...19854083961
injury thresholds and production loss functions for the lone star tick, amblyomma americanum (acari: ixodidae), on pastured, preweaner beef cattle, bos taurus. 19854056195
cytogenetics of ticks (acari: ixodoidea). 18. chromosomes and laboratory biology of amblyomma dissimile. 19854045940
[ecology of tick-borne arboviruses in the central african republic].ticks have been collected on cattle skins for seven consecutive years in bangui, berberati, bangassou and bouar. 150 strains of arboviruses have been isolated from the four following species: amblyomma variegatum: dugbe, jos, thogoto, crimean-congo hemorragic fever (cchf), yellow fever, bhanja and pétévo; boophilus annulatus: dugbe, jos and thogoto; b. decoloratus: dugbe, jos, thogoto and cchf; hyalomma nitidum: cchf. dugbe (112 isolated strains), jos (19 isolates) and thogoto (11 isolates) viru ...19854028317
density estimators for populations of the lone star tick, amblyomma americanum (acari: ixodidae), on pastured beef cattle. 19854009621
systemic activity of a benzimidazoline compound in cattle against ticks and biting flies.a benzimidazoline compound [4-nitro-2-(1,1,2,2-tetrafluoroethyl)-6 -(trifluoromethyl)-1h-benzimidazol-2-, 01, sodium salt] referred to as el-979 showed systemic acaricidal and insecticidal activity in cattle against 2 tick species, amblyomma maculatum (gulf coast tick) and dermacentor variabilis (american dog tick) and adult stomoxys calcitrans (stable flies). larvae of black blow fly (phormia regina) were fed serum collected from treated calves. a complete kill of larvae was obtained with a ser ...19854002603
human infestation by amblyomma americanum larvae ("seed ticks"). 19854002011
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 ...19854000801
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 ...19853998956
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 ...19853998509
cytogenetics of ticks (acari: ixodoidea): chromosomes and timing of spermatogenesis in amblyomma inornatum. 19853981339
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 ...19853972060
the detection of antibodies to cowdria ruminantium in serum and c. ruminantium antigen in amblyomma hebraeum by an enzyme-linked immunosorbent assay.a sensitive and reliable enzyme-linked immunosorbent assay for the detection of antibodies to cowdria ruminantium in serum and c. ruminantium antigen in amblyomma hebraeum nymphae is described. for the screening of antibodies, c. ruminantium from a. hebraeum nymphae, partially purified by wheat-germ lectin affinity chromatography, was used as antigen. to screen nymph populations, sera from either ball 3 strain-infected sheep or kumm-strain infected mice were used. by using appropriate controls t ...19863960490
proof of transovarial transmission of cowdria ruminantium by amblyomma herbraeum.transovarial transmission of cowdria ruminantium by amblyomma hebraeum does occur in certain instances. both the transovarial and the filial infection rates appear to be very low. the infection may reappear only in the adults or nymphae, or in all 3 stages of the tick's life cycle.19863960489
intradermal infestation of a red fox (vulpes vulpes) by the lone star tick (amblyomma americanum). 19863951048
production system-based model for defining economic thresholds in preweaner beef cattle, bos taurus, infested with the lone star tick, amblyomma americanum (acari: ixodidae). 19863950186
density perturbation in populations of amblyomma americanum (acari: ixodidae) in beef cattle forage areas in response to two regimens of vegetation management. 19863950182
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 ...19853923212
a method for determining the cowdria ruminantium infection rate of amblyomma hebraeum: effects in mice injected with tick homogenates.amblyomma hebraeum ticks, collected in the field and individually homogenized, were injected into mice. thirteen out of 240 ticks were shown to be infected with the heartwater agent. antibodies against cowdria ruminantium were detected in the sera of the mice by means of the indirect fluorescent antibody test. giemsa-stained smears, prepared from the haemocytes of the ticks, revealed morphologically different forms of the heartwater agent. a strain of c. ruminantium, designated the welgevonden s ...19853900855
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. % ...19853870959
studies on ticks of veterinary importance in nigeria. xii. oviposition and eclosion in five species of ixodid ticks in contrasting habitats.the preoviposition and oviposition periods, the eclosion periods and numbers of eggs laid by adult ticks of five species, namely amblyomma variegatum, boophilus decoloratus, b. geigyi, hyalomma rufipes and h. truncatum, maintained in a natural habitat were compared with those maintained in semi-natural and artificial habitats. within the natural habitats, "open" and "shady" sites were distinguished. maximum oviposition occurred during the peak of the rains in engorged a. variegatum and b. decolo ...19853870956
[preliminary note on the sensitivity of amblyomma variegatum and boophilus decoloratus (acarida, ixodidae) to organophosphate acaricides in the people's republic of the congo]. 19853841963
observations on the efficacy of ivermectin in the control of cattle ticks in zambia.the efficacy of multiple subcutaneous injections (200 micrograms/kg) of ivermectin in the control of naturally occurring tick infestations on traditionally managed tonga-iia (sanga type) calves and yearlings was assessed in two field trials. in the first trial boophilus decoloratus infestations were decreased following treatments at monthly intervals. in the second trial, with weekly and two weekly treatment intervals, infestations of rhipicephalus appendiculatus were controlled less effectively ...19853841240
efficacy of ivermectin against ectoparasites of cattle in south africa.the efficacy of various formulations of ivermectin administered at the recommended dose rate of 200 micrograms/kg was evaluated in cattle infested with mange mites (sarcoptes scabiei var. bovis.), lice (linognathus vituli and damalinia bovis) and ticks (boophilus decoloratus, amblyomma hebraeum, rhipicephalus appendiculatus and hyalomma spp.) in 8 trials conducted in south africa. mange mites (s. scabiei) were eliminated from animals treated subcutaneously, resulting in marked clinical recovery. ...19853839021
prevalence of ectoparasites of small ruminants in nsukka, nigeria.over a period of one year (january 1983 to december 1983), an investigation was mounted to determine common ectoparasitic infestation of small ruminants in selected farms in nsukka, nigeria. the species identified in goats included ctenocephalides canis, boophilius decolouratus and amblyomma variegatum lides while those recovered from parasitized sheep were ctenocephalides canis and damalinia ovis. out of a total of 148 sheep and goats examined for ectoparasites, 68 (45.95%) were infested. a fur ...19853836218
tick infestation in soldiers who were bivouacked in the perth region.we report observations on infestations with the tick, amblyomma triguttatum, in soldiers who were bivouacked in two areas near perth; 34% of 175 persons were infested with varying stages of the ectoparasite. most persons were infested with only one tick but some troops had multiple infestations. local skin reactions to tick-bites were frequent; they usually developed 24-48 h after removal of the tick and may indicate delayed hypersensitivity reactions. a small number of persons developed seconda ...19873821621
amblyomma variegatum (acari: ixodidae): population dynamics and hosts used during an eradication program in puerto rico. 19873820244
amblyomma calcaratum (acari: ixodidae), a central and south american tick, found in kentucky, usa. 19873820233
a study of the justification for intensive tick control in kenyan rangelands.sixty male weaner cattle at the national range research station, kiboko, kenya were placed in four groups of 15 animals under four different tick control regimens for 16 months. the treatment groups were: spraying with acaricide weekly, spraying every three weeks, spraying whenever group mean tick infestations reached more than 200 per animal (once only in the course of the study) and a control unsprayed group. the cattle were weighed monthly. there were no significant differences between the li ...19863798681
amblyomma arianae, n. sp. (acari: ixodidae), a parasite of alsophis portoricensis (reptilia: colubridae) in puerto rico. 19863795233
ectoparasitic fauna of poultry in nsukka, investigation which lasted for a period of one calendar year was mounted to determine common ectoparasitic fauna of poultry in nsukka, nigeria. this survey covered twenty commercial poultry farms located in different areas of nsukka. birds were picked and thoroughly examined visually for the presence of ectoparasites after horizontal displacement of the feathers against their anatomical direction of alignment. identification was mainly by morphological characteristics, host preference and ana ...19863793395
spotted fever group rickettsiae in the lone star tick, amblyomma americanum (acari: ixodidae). 19863772952
metabolism of [3h]ecdysone by isolated tissues of the female ixodid tick amblyomma hebraeum (ixodoidea; ixodidae).malpighian tubules, gut, ovaries and carcasses of the adult female tick amblyomma hebraeum were incubated in vitro in the presence of 2 microm [3h]ecdysone. organs and media were separately extracted after 6, 24 and 48 h incubations and the patterns of ecdysone metabolites were analyzed by hplc. esterase-susceptible apolar metabolites similar to the ap2 already described in the soft tick ornithodoros moubata and thus presumably corresponding to the same conjugates (c-22 esters with fatty acids) ...19863758475
differentiation between three species of amblyomma ticks (acari: ixodidae) by analysis of cuticular hydrocarbons.cuticular lipids were extracted from three species of amblyomma ticks in hexane: dichloromethane and analysed by gas-liquid chromatography using both packed and capillary columns. unlike many of the reported insect hydrocarbons, those of the amblyomma ticks consisted mostly of branched paraffins and olefins and all three species of ticks are well differentiated on the basis of numbers and carbon-chain lengths of the hydrocarbons. amblyomma maculatum has more olefins and a. cajennense has more pa ...19863753063
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 ...19863744877
the effect of photoperiod on the development of amblyomma triguttatum triguttatum (acari: ixodidae). 19863735330
physiological and biochemical changes in unfed lone star ticks, amblyomma americanum (acari: ixodidae), with increasing age. 19863735326
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