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. 2021 Jan 23;28(3-4):393–402. doi: 10.1186/BF03548607

Seroresponse (IgG) after Vaccination and Natural Infection of Cattle with Babesia Divergens

Antikroppssvar (IgG) efter vaccination eller efter naturlig infektion med Babesia divergens hos nötkreatur

D A Christensson 1,✉, T Morén 1
PMCID: PMC8185784  PMID: 3454550

Abstract

The antibody response against Babesia divergens in vaccinated calves and in unvaccinated sentinels on farms where vaccination had been practiced routinely, was investigated using a live vaccine.

Sera were obtained before and 3 weeks after vaccination in March and April, approximately 1 month before the animals were put out on pasture. Additional blood samples were collected at the end of the grazing season and again the next spring. At that time previously unvaccinated sentinel calves were vaccinated and their antibody response was tested 3 weeks later. All sera were analysed by an IF-technique. All of the vaccinated calves (100%) were seropositive 3 weeks after vaccination. The seroresponse did not differ signifacantly between animals vaccinated before their first or second grazing season although the age difference was about 12 months. No clinical symptoms of babesiosis were seen in vaccinated animals. The titres were, however, significantly higher 3 weeks after vaccination than 6 months later.

After the grazing season about 42% of the unvaccinated sentinel calves were sero–positve. Two of these calves had clinical babesiosis on pasture in July and September respectively.

The number of sentinel calves which became infected on pasture showed a large farm-to-farm variation although all cattle on the farms once had been infected-/vaccinated with B. divergens. Probably the different number of calves infected was a reflection of a variation in tick density on the different pastures. All calves, which were seropositive after the grazing season, were also seropositive after 6 months indoors. The titres declined during the winter period, but they were still within the range of 2 doubling dilution steps.

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