Natural Ehrlichia phagocytophila transmission coefficients from sheep 'carriers' to Ixodes ricinus ticks vary with the numbers of feeding ticks.

@article{Ogden2002NaturalEP,
  title={Natural Ehrlichia phagocytophila transmission coefficients from sheep 'carriers' to Ixodes ricinus ticks vary with the numbers of feeding ticks.},
  author={Nicholas H. Ogden and Amber J. Casey and Nigel P French and Kevin John Bown and Jackson W Adams and Zerai Woldehiwet},
  journal={Parasitology},
  year={2002},
  volume={124 Pt 2},
  pages={127-36}
}
In a longitudinal study in a UK upland site, 38% of adult sheep were detected as infected with the tick-borne bacterium Ehrlichia phagocytophila by PCR of blood samples. Infection prevalence declined significantly with sheep age but varied significantly and non-linearly with the number of adult Ixodes ricinus ticks feeding per sheep. These findings suggested that under conditions of natural repeated tick-borne challenge sheep remain partially susceptible to re-infections, but the likelihood of… CONTINUE READING

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