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Studies in Tick-borne Fever of Sheep. I. Transmission by the Tick, Ixodes ricinus, with a Description of the Disease Produced

Published online by Cambridge University Press:  06 April 2009

J. Macleod  and
W. S. Gordon
J. Macleod
Affiliation:
From the Moredun Research Institute, Edinburgh.
W. S. Gordon
Affiliation:
From the Moredun Research Institute, Edinburgh.
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Extract

1. The causal agent of tick-borne fever is transmitted by the adult female and the nymphal stage of the tick Ixodes ricinus. Two female ticks are sufficient to produce infection in a sheep. The larval stage does not appear to be infective. In a limited number of experiments the disease has not been produced in sheep by the inoculation of emulsions of presumably infective ticks.

2. The disease as produced by tick infestation is characterised by a period of incubation which varies from 3 to 13 days, after which there is a sharp rise in temperature; a “plateau” type of febrile reaction follows which lasts from 6 to 22 days, the temperature gradually subsiding to normal. Affected animals usually recover. Mortality as a direct result of infection is rare, but there is evidence to suggest that tick-borne fever may predispose affected animals to death from secondary causes.

3. The blood of a sheep which has reacted to the disease remains infective for some time after the subsidence of the thermal reaction.

4. The goat is susceptible to tick-borne fever.

5. The economic importance of tick-borne fever is discussed.

Type
Research Article
Information
Parasitology , Volume 25 , Issue 2 , April 1933 , pp. 273 - 283
Copyright
Copyright © Cambridge University Press 1933

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References

REFERENCES

Gordon, W. S., Brownlee, A., Wilson, D. R. and Macleod, J. (1932 a). Studies in louping-ill. I. J. Comp. Path. and Ther. 45, 106.CrossRefGoogle Scholar
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Macleod, J. (1932). Preliminary studies in the tick transmission of louping-ill. Vet. J. 88, 276.Google Scholar
Macleod, J. and Gordon, W. S. (1932). Studies in louping-ill. II. Transmission by the sheep tick, Ixodes ricinus L. J. Comp. Path. and Ther. 45, 240.CrossRefGoogle Scholar
Theiler, A. (1928). Transmission of tick-borne diseases by the intrajugular injection of the emulsified intermediary host itself. 13th and 14th Rep. Dir. Vet. Res. S. Africa, P. 17.Google Scholar