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- W2078641301 abstract "Bovine babesiosis is caused by Babesia bovis and B. bigemina in Argentina. These protozoans are prevalent north of parallel 30 degrees 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. In non-endemic areas, an additional calf population is also vaccinated and boostered as adults, before they are relocated to R. microplus-endemic areas of the country. Serological tests are currently utilized not only to determine the status of natural Babesia spp. infections, but also to confirm the infection caused by vaccine strains. For this purpose, an indirect enzyme immunoassay (ELISA) based on the recombinant major surface antigen-2c (rMSA-2c) of B. bovis expressed in Escherichia coli, was standardized using sera from Babesia spp. experimentally infected cattle. ELISA(rMSA-2c) was validated using sera obtained weekly during 336 days from steers primed and boostered with BboR1A and/or BbiS1A on days 0 and 154, then compared with the immunofluorescent-antibody test (IFAT). Western blot (WB) protein analysis was used to confirm the specificity of the immune response to rMSA-2c. The sensitivity and specificity for ELISA(rMSA-2c) were 92 and 96% after the Babesia spp. priming and 88 and 73% after the boostering immunization, respectively. The sensitivity and specificity for IFAT were 99 and 90% after priming and 92 and 98% after boostering, respectively. Unlike IFAT, ELISA(rMSA-2c) detected a remarkable delayed booster response and a significant drop in specificity between 35 and 84 days after the booster immunization. Simultaneously, 87.5% of cattle boostered with B. bigemina showed cross-reactions in the ELISA(rMSA-2c), particularly between 63 and 77 days after the inoculation. A reaction against E. coli was observed, since bands of approximately 40 and/or 42kDa were detected using sera from cattle before and after Babesia spp. inoculations. ELISA(rMSA-2c) showed to be useful between 42 and 98 days after priming with Babesia spp. live vaccine to evaluate the success of infecting cattle. However, after boostering the test showed low specificity." @default.
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- W2078641301 date "2008-11-01" @default.
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- W2078641301 title "Efficiency of a recombinant MSA-2c-based ELISA to establish the persistence of antibodies in cattle vaccinated with Babesia bovis" @default.
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- W2078641301 doi "https://doi.org/10.1016/j.vetpar.2008.07.025" @default.
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