| the ecology of the african vectors of heartwater, with particular reference to amblyomma hebraeum and amblyomma variegatum. | the hosts, sites of attachment, life cycle, habitat requirements and seasonal abundance of amblyomma astrion, amblyomma cohaerens, amblyomma gemma, amblyomma hebraeum, amblyomma lepidum, amblyomma marmoreum, amblyomma pomposum, amblyomma sparsum, amblyomma tholloni and amblyomma variegatum, the 10 potential vectors of heartwater in africa, are listed. factors influencing the distribution and abundance of the ticks as well as interactions with other species and the role of predators and pathogens ... | 1987 | 3329326 |
| isolation and transmission of cowdria ruminantium (causal agent of heartwater disease) in blue nile province, sudan. | heartwater was diagnosed in sheep at the umm banein livestock research station, blue nile province, sudan. cowdria ruminantium was isolated from sheep by subinoculation of blood into a goat. adult amblyomma lepidum ticks fed as nymphs on this goat transmitted heartwater to a friesian (bos taurus) calf. brain stabilates from this calf, either snap-frozen into liquid nitrogen or frozen slowly in a deepfreezer at -70 degrees c, with dmso as cryoprotectant, were infective to cattle when inoculated s ... | 1984 | 6740919 |
| the seasonal occurrence of ticks (acari: ixodidae) on sheep and in the field in the judean area of israel. | a 2 year survey of ixodid ticks in the judean area of israel between 1983 and 1985 showed that sheep were parasitized by the following species: rhipicephalus sanguineus group (30.6%), rhipicephalus bursa (25.3%), haemaphysalis cretica (20.5%), haemaphysalis otophila (20.1%) and hyalomma anatolicum excavatum (3.1%). three other species, hyalomma marginatum rufipes, boophilus annulatus and amblyomma lepidum were also present but in very low numbers. a total of 50,816 specimens (78.1% adult ticks) ... | 1996 | 8746133 |
| tick infestation of borana cattle in the borana province of ethiopia. | a study was conducted to identify and determine burdens of ticks infesting borana cattle in the borana province of ethiopia. rhipicephalus pulchellus, rhipicephalus pravus, rhipicephalus muhsamae, rhipicephalus praetextatus, rhipicephalus evertsi evertsi, amblyomma gemma, amblyomma variegatum, amblyomma cohaerens, amblyomma lepidum, hyalomma truncatum, hyalomma marginatum rufipes and boophilus decoloratus were identified on the cattle. their burdens ranged from 658-1,554 with a mean of 1,205 tic ... | 2001 | 11403429 |
| preliminary survey of ticks (acari: ixodidae) on cattle in northern sudan. | in a cross sectional survey conducted during the period june 2001 to july 2002, the geographical distribution of ticks on cattle in the sudan was determined. seventeen locations were surveyed from northern, central, eastern, western, blue nile and white nile provinces. total body collections of ticks were made from 20 cattle at each location. four tick genera and 11 species were identified. the tick species collected included amblyomma lepidum, amblyomma variegatum, boophilus decoloratus, hyalom ... | 2004 | 15732459 |
| drop off rhythm and survival periods of amblyomma lepidum (acari: ixodidae) under field conditions. | in this study, engorged amblyomma lepidum ticks were found to drop off in two peaks, one in the morning and one in the evening. most larvae and females engorged during the morning hours between 06.00 h and 10.00 h with a peak around 08.00 h, whereas the majority of the nymphs dropped in the evening between 18.00 h and 24.00 h with the peak around 22.00 h. although the effect of time on drop-off patterns of the ticks was statistically significant (p< or = 0.001), there were no significant seasona ... | 2005 | 16132736 |
| molecular detection of spotted fever group rickettsiae in ticks from ethiopia and chad. | dna extracted from 363 ticks collected in ethiopia and 9 ticks collected in chad, africa were screened by pcr to detect dna from spotted fever group rickettsiae. fifteen ticks (4.1%) collected in ethiopia and one tick (11%) collected in chad tested positive when pcr targeting the glta and ompa rickettsial genes was performed. pcr-positive products of the glta and ompa genes were used for dna sequencing. rickettsia africae was detected in 12/118 amblyomma lepidum and in 1/2 a. variegatum. also, 2 ... | 2008 | 18440576 |
| distribution and population dynamics of ticks (acari: ixodidae) infesting sheep in sennar state, sudan. | a cross-sectional survey of ticks infesting sheep was conducted in sennar state, sudan. a total body collection of ticks was carried out at five localities sennar town, singa, dinder, abu naama and um banein on two types of desert sheep (watish and ashgar) on two farms at each locality at two monthly intervals for one year starting july 2002 to may 2003. four tick genera and eight species were identified. they were amblyomma lepidum, hyalomma anatolicum anatolicum, hyalomma truncatum, rhipicepha ... | 2007 | 18453239 |
| reliminary survey of ticks (acari: ixodidae) on cattle in central equatoria state, southern sudan. | in a preliminary survey conducted in 2005, the species composition and seasonality of ticks infesting cattle in central equatoria state, southern sudan was determined. three locations were selected (gumbo, khor rumla and nyaing) and surveyed every 3 months. two cattle herds in each of the three locations were visited four times during the study period. total body collections of ticks were made from each of five cattle (nilotic zebu breed) kept in six different herds. four tick genera and ten spe ... | 2008 | 18575063 |
| development of the immature stages of amblyomma lepidum (acari: ixodidae) under field conditions. | according to this study, the effect of seasonality on the development of larvae and nymphs of amblyomma lepidum was highly significant (p< or =0.001). the moulting of larvae was only possible in the rainy season, where means of 76.8 and 73.1% were recorded in the first and the second year, respectively. nymphs, in the same period, achieved 68.8 and 71.8% moult. in winter, only 11.8 and 12.2% of nymphs succeeded to moult in the first and the second year, respectively. males outnumbered females, b ... | 2009 | 19709816 |
| the influence of temperature and humidity on oviposition and hatchability of amblyomma lepidum (dönitz, 1808) (acarina: ixodidae) under laboratory conditions. | the effect of temperature and humidity on the oviposition and hatchability of ablyomma lepidum was studied. above 90% of adult ticks applied on calves succeeded to attach and feed through 6-13 days. the development process was studied under three levels of temperature: 27, 35 and 40 degrees c, each level with five sets of humidity. temperature rather than humidity affected all developmental parameters. it was found that high temperature of 40 degrees c, even at high humidity 75.5-97.8% significa ... | 2010 | 20434269 |
| survey of ixodid ticks in domestic ruminants in bedelle district, southwestern ethiopia. | a survey aimed at determining the status of ticks in cattle, sheep and goats in bedelle district (southwestern ethiopia) was carried out from november 2007 to april 2008. out of the total 330 animals examined, 314 (95.2%) were found to be infested (harbouring of at least a single tick). high rates of infestations were recorded across all three host species. factors like month of collection, age and sex of host species did not show significant association with infestation rates. a total of 5,507 ... | 2010 | 20563884 |
| ticks (acari: ixodidae) infesting cattle and african buffaloes in the tsavo conservation area, kenya. | several ixodid tick species are shared between domestic cattle and african buffaloes (syncerus caffer). so too, are a number of tick-borne diseases. the aim of the study was to compare the species composition of ticks that infest cattle and buffaloes utilising the same habitat within the tsavo conservation area, kenya. to this end, 25 cattle and 62 buffaloes were each opportunistically sampled for ticks on a single occasion in february 2010. eight species, namely amblyomma gemma, amblyomma lepid ... | 2012 | 23327329 |
| isolation of tick and mosquito-borne arboviruses from ticks sampled from livestock and wild animal hosts in ijara district, kenya. | tick-borne viruses infect humans through the bite of infected ticks during opportunistic feeding or through crushing of ticks by hand and, in some instances, through contact with infected viremic animals. the ijara district, an arid to semiarid region in northern kenya, is home to a pastoralist community for whom livestock keeping is a way of life. part of the ijara district lies within the boundaries of a kenya wildlife service-protected conservation area. arbovirus activity among mosquitoes, a ... | 2013 | 23805790 |
| improved molecular detection of ehrlichia and anaplasma species applied to amblyomma ticks collected from cattle and sheep in ethiopia. | detection of ehrlichia and anaplasma species in animals and tick vectors is crucial for an understanding of the epidemiology of diseases caused by these pathogens. in this study, a pair of primers designated ebr2 and ebr3 was designed from the anaplasma 16s rdna sequence and was used along with a previously described primer ehr 16sd for the simultaneous detection of ehrlichia and anaplasma species by nested pcr. the primers were used to amplify 925bp of dna from known species of ehrlichia and an ... | 2015 | 25438799 |
| ticks infesting cattle in central equatoria region of south sudan. | ticks infesting cattle represent a serious problem for improvement of cattle productivity in south sudan. there has been limited information on ticks and tick-borne diseases in southern sudan. this study was initiated to update the current distribution of ticks infesting cattle in the central equatoria region of south sudan. the surveys for the present study were conducted at various cattle camps in juba, mangalla and terekeka between december 2004 and june 2005. a total of 2322 ticks were colle ... | 2011 | 23327220 |