TABLE 3.

Tick transmission of A. marginale to naïve calves

StrainResult of test on indicated daya
Giemsa-stained blood smearsbMSP5 cELISAmsp5 PCR
254575100254575100254575100
A. marginale subsp. centrale
A. marginale Saint Maries++±c±d+++++++
A. marginale Mississippi
  • a Number of days after the removal of ticks.

  • b Microscopic examination of a minimum of 50 high-power fields.

  • c One animal remained Giemsa stain positive; the second animal had A. marginale levels below the limit of microscopic detection.

  • d One animal had seroconverted at day 25; the second animal had not yet seroconverted at this time point.