L. L. Callow

TL;DR: The acquired immunity of twenty-eight splenectomized and twenty-three intact cattle following primary inoculation with either of two strains of Babesia bigemina was investigated and it was shown that substantial homologous immunity had developed within 16 weeks of the primary infection in animals which were no longer carrying B.bigemina.

TL;DR: It was found that ticks were susceptible to infection for approximately the last day of their parasitic life and infection at other times, that is, during larval, nymphal and the major part of the adult stages was not usual.