A Comparative Study Of The Diseases In Cati'le Caused By Theileria Lawrencei And Theileria Par Va. 1. Clinical Signs And Parasitological Observations

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Jura W.G.Z
Losos G.J
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Kenya Agricultural Research Institute
A comparison was made between the clinical signs and blood and lymph node parasite levels in cattle reacting to the inoculation of tick-derived stabilates of Theileria lawrencei (TL), and T. parva at high dose (TPH) and low dose (TPL) levels. The TL and TPH infections produced acute diseases with statistically similar times to death of 13.50 and 14.25 days, respectively, while TPL caused a more protracted but equally fatal disease of 20 days duration. In the TPL group, the local drainage lymph node (LDLN) became enlarged earlier and macroschizonts appeared later than in the TPH group. The characteristics of T. lawrencei infection which differentiated it from T. parva infection were: nervous signs; complete anorexia; low macroschizont index (MSI) levels of up to 5%; and lack of piroplasms. In T. paroa groups, the high MSI levels of up to 60%, presence of piroplasms and dysentery were characteristic. In addition, the enlargement of lymph nodes in the TL group persisted to time of death, while in both T. paroa infections the initial enlargement was followed by a decrease in size.