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The relationship between tick (Amblyomma hebraeum) infestation and immunity to heartwater (Cowdria ruminantium infection) in calves in Zimbabwe.
Norval RA, Donachie PL, Meltzer MI, Deem SL, Mahan SM. Norval RA, et al. Vet Parasitol. 1995 Jul;58(4):335-52. doi: 10.1016/0304-4017(94)00733-s. Vet Parasitol. 1995. PMID: 8533273
We conducted a study in a heartwater-endemic area in southeastern Zimbabwe to investigate the relationships between calf immunity to C. ruminatium, infestations of the tick vector Amblyomma hebraeum and dam, colostral and calf antibody titres to C. ruminantium
We conducted a study in a heartwater-endemic area in southeastern Zimbabwe to investigate the relationships between calf immunity to C. rumi …
Amblyomma hebraeum is the predominant tick species on goats in the Mnisi Community Area of Mpumalanga Province South Africa and is co-infected with Ehrlichia ruminantium and Rickettsia africae.
Jongejan F, Berger L, Busser S, Deetman I, Jochems M, Leenders T, de Sitter B, van der Steen F, Wentzel J, Stoltsz H. Jongejan F, et al. Parasit Vectors. 2020 Apr 21;13(1):172. doi: 10.1186/s13071-020-04059-5. Parasit Vectors. 2020. PMID: 32312285 Free PMC article.
BACKGROUND: In sub-Saharan Africa, Amblyomma ticks are vectors of heartwater disease in domestic ruminants, caused by the rickettsial pathogen Ehrlichia ruminantium. ...Amblyomma hebraeum was present throughout the year, with peak activity of ad …
BACKGROUND: In sub-Saharan Africa, Amblyomma ticks are vectors of heartwater disease in domestic ruminants, caused by the rickettsial …
Distributions of the vectors of heartwater, Amblyomma hebraeum and Amblyomma variegatum (Acari: Ixodidae), in Zimbabwe.
Peter TF, Perry BD, O'Callaghan CJ, Medley GF, Shumba W, Madzima W, Burridge MJ, Mahan SM. Peter TF, et al. Exp Appl Acarol. 1998 Dec;22(12):725-40. doi: 10.1023/a:1006045508522. Exp Appl Acarol. 1998. PMID: 10030008
The tick vectors of heartwater (Cowdria ruminantium infection) in Zimbabwe, Amblyomma hebraeum and Amblyomma variegatum, historically were believed to be confined to the low-lying regions of the south and north-west of the country. ...Amblyomma
The tick vectors of heartwater (Cowdria ruminantium infection) in Zimbabwe, Amblyomma hebraeum and Amblyomma var …
Climate changes and suitability for the ticks Amblyomma hebraeum and Amblyomma variegatum (Ixodidae) in Zimbabwe (1974-1999).
Estrada-Peña A, Horak IG, Petney T. Estrada-Peña A, et al. Vet Parasitol. 2008 Feb 14;151(2-4):256-67. doi: 10.1016/j.vetpar.2007.11.014. Epub 2007 Nov 17. Vet Parasitol. 2008. PMID: 18083309
The spread of Amblyomma hebraeum has been reported in Zimbabwe. At the same time there was little or no spread in the distribution of Amblyomma variegatum. ...Without adequate control measures, invasive waves of A. hebraeum may occur over a background …
The spread of Amblyomma hebraeum has been reported in Zimbabwe. At the same time there was little or no spread in the distribu …
The prevalence of Cowdria ruminantium in free-living adult Amblyomma hebraeum collected at a communal grazing area and in 2 wildlife reserves in South Africa.
Bryson NR, Horak IG, Venter EH, Mahan SM, Simbi B, Peter TF. Bryson NR, et al. J S Afr Vet Assoc. 2002 Sep;73(3):131-2. doi: 10.4102/jsava.v73i3.575. J S Afr Vet Assoc. 2002. PMID: 12515301
In order to detect the prevalence of Cowdria ruminantium in the vector tick, Amblyomma hebraeum, free-living, unfed adult ticks were collected with the aid of pheromone/CO2 traps. ...These results support the contention that a vector-wildlife cycle of transmi …
In order to detect the prevalence of Cowdria ruminantium in the vector tick, Amblyomma hebraeum, free-living, unfed adu …
Laboratory reared Amblyomma hebraeum and Amblyomma variegatum ticks differ in their susceptibility to infection with Cowdria ruminantium.
Mahan SM, Peter TF, Semu SM, Simbi BH, Norval RA, Barbet AF. Mahan SM, et al. Epidemiol Infect. 1995 Oct;115(2):345-53. doi: 10.1017/s0950268800058465. Epidemiol Infect. 1995. PMID: 7589273 Free PMC article.
The susceptibility of laboratory reared Zimbabwean Amblyomma hebraeum and A. variegatum ticks to infection with geographically distinct Cowdria ruminantium strains was investigated by feeding both species simultaneously on individual sheep infected with one o …
The susceptibility of laboratory reared Zimbabwean Amblyomma hebraeum and A. variegatum ticks to infection with geographically …
Prevalence of Cowdria ruminantium infection in Amblyomma hebraeum ticks from heartwater-endemic areas of Zimbabwe.
Peter TF, Perry BD, O'Callaghan CJ, Medley GF, Mlambo G, Barbet AF, Mahan SM. Peter TF, et al. Epidemiol Infect. 1999 Oct;123(2):309-16. doi: 10.1017/s0950268899002861. Epidemiol Infect. 1999. PMID: 10579452 Free PMC article.
Analysis of the transmission dynamics of Cowdria ruminantium, the tick-borne rickettsial agent of heartwater in ruminants, requires accurate measures of infection in vector populations. To obtain these, Amblomnia hebraeum ticks were collected at two heartwater-endem …
Analysis of the transmission dynamics of Cowdria ruminantium, the tick-borne rickettsial agent of heartwater in ruminants, requires a …
Parasites of domestic and wild animals in South Africa. L. Ixodid ticks infesting horses and donkeys.
Horak IG, Heyne H, Halajian A, Booysen S, Smit WJ. Horak IG, et al. Onderstepoort J Vet Res. 2017 Feb 28;84(1):e1-e6. doi: 10.4102/ojvr.v84i1.1302. Onderstepoort J Vet Res. 2017. PMID: 28281774 Free PMC article.
Horses were infested with 17 tick species, 72.1% with Rhipicephalus evertsi evertsi, 19.4% with Amblyomma hebraeum and 15.6% with Rhipicephalus decoloratus. ...Amblyomma hebraeum is the vector of Ehrlichia ruminantium, the causative organ …
Horses were infested with 17 tick species, 72.1% with Rhipicephalus evertsi evertsi, 19.4% with Amblyomma hebraeum and 15.6% w …
The relationship between Cowdria and Ehrlichia: change in the behaviour of ehrlichial agents passaged through Amblyomma hebraeum.
Du Plessis JL. Du Plessis JL. Rev Elev Med Vet Pays Trop. 1993;46(1-2):131-43. Rev Elev Med Vet Pays Trop. 1993. PMID: 8134623
Following an earlier report that an Ehrlichia-like agent isolated from an adult Hyalomma truncatum female became more pathogenic and elicited a disease in sheep indistinguishable from heartwater after having been passaged through Amblyomma hebraeum, a similar …
Following an earlier report that an Ehrlichia-like agent isolated from an adult Hyalomma truncatum female became more pathogenic and …
Detection of the agent of heartwater, Cowdria ruminantium, in Amblyomma ticks by PCR: validation and application of the assay to field ticks.
Peter TF, Barbet AF, Alleman AR, Simbi BH, Burridge MJ, Mahan SM. Peter TF, et al. J Clin Microbiol. 2000 Apr;38(4):1539-44. doi: 10.1128/JCM.38.4.1539-1544.2000. J Clin Microbiol. 2000. PMID: 10747140 Free PMC article.
The assay did not detect DNA of Ehrlichia chaffeensis, which is closely related to C. ruminantium. PCR sensitivity varied with tick infection intensity and was high (97 to 88%) with ticks bearing 10(7) to 10(4) organisms but dropped to 61 and 28%, respectively, with …
The assay did not detect DNA of Ehrlichia chaffeensis, which is closely related to C. ruminantium. PCR sensitivity varied with …
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