TRANSMISSION OF THEILERIA-PARVA-BOVIS BY NYMPHS OF RHIPICEPHALUS-APPENDICULATUS

Theileria parva bovis (a protozoan causing January disease of cattle i n Zimbabwe) was transmitted experimentally by nymphs of the tick Rhipi cephalus appendiculatus to six of 14 cattle. Animals either became ser iously ill or did not become infected. Attempts to induce mild or inap parent infection by reducing the number of infecting nymphs were not s uccessful. In the epidemiology of January disease nymphal transmission is, however, apparently of little importance, notwithstanding the exp erimental results.