title: Immunity in cattle to Babesia bovis after single infections with parasites of various origin.
abstract: Sixty calves, 3 to 6 months old, were vaccinated once against Babesia bovis in groups of 10, by the following methods: (a) tick infestation; (b) inoculation of virulent parasites obtained from the tick-infested animals immediately after infection; (c) inoculation of the parasites used in (b) attenuated by passage through splenectomised calves; (d) inoculation of commercially-available, living, attenuated vaccine; (e) inoculation of virulent parasites obtained from the tick-infested animals in (a) one year after infection; (f) inoculation of the parasites used in (e) attenuated by passage. All vaccinated animals were maintained tick-free and were strongly immune to challenge with a heterologous strain of B. bovis approximately 4 years after vaccination. There was no difference in immunogenicity between any of the B. bovis populations.
mesh_terms: D000818:Animals; D001403:Babesia / Q000276:immunology; D001404:Babesiosis / Q000276:immunology / Q000662:veterinary*; D002417:Cattle; D002418:Cattle Diseases / Q000276:immunology*; D007109:Immunity; D014611:Vaccination