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Bovine babesiosis is caused by Babesia bovis and B. bigemina in Argentina. These protozoans are prevalent north of parallel 30°S, where their natural vector Rhipicephalus (Boophilus) microplus is widespread. To prevent babesiosis outbreaks in endemic areas, an increasing population of 4–10-month-old calves are vaccinated with low virulence B. bovis R1A (BboR1A) and B. bigemina S1A (BbiS1A) strains...