Bovine resistance to Amblyomma americanum ticks: An acquired immune response characterized by cutaneous basophil infiltrates

Brown, Stephen J.; Barker, R. W.; Askenase, Philip W.

doi:10.1016/0304-4017(84)90016-5

Cited by 44 publications

(33 citation statements)

References 33 publications

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“…Cattle of various breeds acquire resistance to adults of A. amm"ca/JKm (Strotheretal., 1974;Brown et al, 1984;George et al, 1985). Resistance results in reduced numbers of female ticks completing feeding, reductions in the engorged weights of females and, as a consequence of the latter, reduced egg production.…”

Section: Host Responses To Infestation With Other Amblyomma Sppmentioning

confidence: 97%

Host susceptibility to infestation with Amblyomma hebraeum

Norval

1992

Int. J. Trop. Insect Sci.

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Amblyomma hebraeum differs from many ixodid tick species in that it is not susceptible to the direct effects of the host immune response. All stages of the life cycle are able to feed repeatedly on laboratory hosts and show no progressive declines in engorged weight. However, on cattle there are declines in the yield of engorged adult females over time, as animals become sensitized to the tick and grooming increases. In the field zebu, Bos indicus and sanga, B. indicus x B. taunts breeds of cattle become less heavily infested than B. taurus breeds. The apparent resistance of zebu and sanga breeds is the result of learned tick avoidance behaviour, skin sensitivity and the ability to dislodge ticks prior to attachment as well as grooming ability. Among other Amblyomma spp., the feeding of A. americanum is adversely affected by acquired host immunity, while that of A. variegatum is generally unaffected.Resuml-A mblyomma hebraeum differe de beaucoup d'especes de tiques ixodides en ce sens qu'elle n'est pas susceptible aux effets directs de la reponse immune de l'hdte. Toutes les etapes du cycle de vie peuvent se nourrir a plusieurs reprises d'hdtes laboratoires et ne montrent pas de baisses progressives de poid quand elles sont pleines. Cependant, sur les boeufs il y a au cours du temps des d&Iins de rendement de femelles adultes pleines, comme les animaux se sensibilisent a la tique et le pansement s'augmente. Aux champs, les races de boeufs zebu, Bos indicus et les sanga, B. indicus x B. taurus deviennent moins infestes que les races B. taurus. La resistance apparente des races zebu et sanga est le resultat d'un comportement appris de l'e vasion de tiques, de la sensibilite de la peau et de la capacity de detacher les tiques avant qu'elles ne s'attachent, de mime que de l'habilite de se panser. Entre d'autres especes A'Amblyomma, l'immunite acquise sur le part de l'hdte produit un effet defavorable sur le parasitisme d'A. americanum, tandis qu'en general elle ne produit aucun effet sur celui d'A. variegatum.

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Section: Host Responses To Infestation With Other Amblyomma Sppmentioning

confidence: 97%

Host susceptibility to infestation with Amblyomma hebraeum

Norval

1992

Int. J. Trop. Insect Sci.

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“…adverse effect on male ticks and lack of mating with females was also observed (Brown, Barker and Askenase, 1984) in Amblyomma americanum during repeated infestations in Bos taurus cattle.…”

Section: Resultsmentioning

confidence: 77%

“…In the present study, significant reduction in average engorgement per cent, egg batches laid and engorged weight was observed. However, Brown et al, (1984) concluded that numbers of A. americanum from resistant bovines were normal but the engorgement weight and egg batch weight was reduced significantly. It suggests a dual mechanism of the immune response, one part directed against the tick attachment phase and the other against the engorging phase.…”

Section: Discussionmentioning

confidence: 93%

“…Using 300 pairs of ticks in Bos taurus, Bos indicus and crossbred cattle (Strother et al, 1974), 50 pairs in Bos taurus (Brown et al, 1984) or 15 ticks (i.e. 10 females and five males) in Bos indicus and crossbred calves (George et al, 1985) with A. americanum, and 30 pairs of H. a. anatolicum in Bos taurus (Gill, 1986), better resistance was developed.…”

Section: Discussionmentioning

confidence: 98%

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Attempted immunisation of crossbred calves (Bos taurus × Bos indicus) by repeated natural attachment of ticksHyalomma anatolicum anatolicum Koch (1844)

Momin

Banerjee

Samantaray

1991

Trop Anim Health Prod

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Crossbred calves (Bos taurus x Bos indicus) were repeatedly infested with the ixodid tick, Hyalomma anatolicum anatolicum. The parameters of engorgement, pre-oviposition period, oviposition period, engorged weight, egg batch weight, and per cent hatch of eggs all showed statistically significant differences between first to tenth infestation. Only the time to engorgement did not change. It is concluded that repeated infestations of this tick stimulate acquired resistance.

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“…The development of cellular reactions in guinea-pigs in response to repeated tick infestations are characterised by a cutaneous basophil hypersensitivity (Brown et al, 1983). This type of cellular reaction has also been demonstrated by repeated infestations of Amblyomma americanum on bovine hosts (Brown et aL, 1984). However, with A.variegatum feeding on rabbit hosts, the initial cellular reactions are predominantly neutrophil and mononuclear infiltration with eosinophils also infiltrating attachment sites after repeated infestations (Latif et al, 1990).…”

Section: Introductionmentioning

confidence: 92%

The effect of inflammatory and hypersensitive reactions, in response to the feeding of the tick Amblyomma variegatum, on the progression of experimental dermatophilosis infections

Lloyd

Walker

1993

Exp Appl Acarol

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Initial infestations of Amblyomma variegatum larvae and nymphs, on rabbits and sheep respectively, produced inflammatory reactions in the host's skin; repeated infestations resulted in an increase in development of delayed type hypersensitive reactions. Dermatophilus congolensis cocci were applied in titrated doses to hosts at sites of inflammatory or hypersensitive reactions to ticks, and to control hosts with no exposure to ticks. We assessed the resulting infections for three weeks and found no significant difference between the infections on the three groups. We conclude that the local effects of the feeding of immature stages of this tick do not influence the pathogenesis of dermatophilosis.

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Bovine resistance to Amblyomma americanum ticks: An acquired immune response characterized by cutaneous basophil infiltrates

Cited by 44 publications

References 33 publications

Host susceptibility to infestation with Amblyomma hebraeum

Host susceptibility to infestation with Amblyomma hebraeum

Attempted immunisation of crossbred calves (Bos taurus × Bos indicus) by repeated natural attachment of ticksHyalomma anatolicum anatolicum Koch (1844)

The effect of inflammatory and hypersensitive reactions, in response to the feeding of the tick Amblyomma variegatum, on the progression of experimental dermatophilosis infections

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