Those reported by Masake are the most sensitive ones and work well.
R. A. Masake, P. A. Majiwa, S. K. Moloo, J. M. Makau, J. T. Njuguna,
V. M. Nantulya, “Sensitive and Specific Detection of Trypanosoma vivax Using the Polymerase Chain Reaction,” Experimental Parasitology, Vol. 85, No. 2, 1997, pp. 193-205. doi:10.1006/expr.1996.4124