Neitz, Albert Walter Herman; Viljoen, G.J.; Van Wyngaardt, S.; Gothe, R.; Visser, L.; Bezuidenhout, J. Dürr; Verwoerd, Daniel Wynand
(Published by the Government Printer, Pretoria., 1990)
One-day-old leghorn chickens were used in a laboratory assay to determine the toxicity of crude extracts of the tick Argas (Persicargas) walkerae and of fractions obtained during the isolation procedure. Extracts of unfed ...