IMMUNOLOGICAL ASPECTS OF THEILERIA ANNULATA INFECTION IN CALVES .1. E, EA, AND EAC ROSETTE FORMING CELLS IN CALVES INFECTED WITH T ANNULATA

  • 1 January 1981
    • journal article
    • research article
    • Vol. 32  (2) , 101-104
Abstract
Peripheral blood lymphocytes (PBL) from normal and T. annulata-infected calves were assayed for E [erythrocyte], EA [sensitized erythrocyte] and EAC [erythrocyte-antibody-complement] rosette formation. The E rosette forming cells showed the 1st increase on day 8 of infection. This continued in all animals until day 14 when the maximum increase was recorded. After that they showed reduced percentages of E rosettes, reaching normal values (as obtained before the infection) on day 24-30. When the recovered animals were challenged 64 days after the 1st infection, an increase in the percentage of E rosette formation was again observed. Although a moderate increase in the percentage of EAC rosette formation was recorded the tendency was the same as for E rosettes in regard to the course of the infection. In contrast to E rosettes, EAC rosettes remained constant during the challenge infection. The EA rosette forming cells generally had the same tendency as E rosettes during both the 1st and the challenge infection.

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