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Ciência Rural

Print version ISSN 0103-8478On-line version ISSN 1678-4596

Abstract

LIMA, Marcelo de; VOGEL, Fernanda Silveira Flôres; FLORES, Eduardo Furtado  and  WEIBLEN, Rudi. Vaccination-induced neutralizing antibodies against bovine viral diarrhea virus (BVDV): comparison between an experimental modified-live vaccine and three comercial inactivated vaccines. Cienc. Rural [online]. 2005, vol.35, n.1, pp.230-234. ISSN 0103-8478.  https://doi.org/10.1590/S0103-84782005000100039.

The titers and duration of neutralizing antibodies against bovine viral diarrhea virus (BVDV) induced by an experimental attenuated vaccine (vaccine A: one dose) were compared to those induced by three commercial inactivated ones (B, C and D: two doses at a 30 day interval). Thirty days after vaccination (vaccine A) or the second dose (vaccines B, C and D), neutralizing antibodies to BVDV-1 were detected in all calves (12/12) from group A (mean geometric titer GMT=1612.7); in 32 out of 36 from group B (GMT=14.3); 22/28 from group C (GMT=25.1); 16/30 from group D (GMT=40.0). Antibodies reacting with BVDV-2 were detected in all animals from group A (GMT=151.0); 27/36 from group B (GMT=10.0); 12/28 from group C (GMT=11.5) and in 10 out of 30 animals of group D (GMT=10.0). At day 180 post-vaccination, the number of animals reacting to BVDV-1 and the GMTs were: vaccine A (12/12, GMT=905.0); vaccine B (30/36, GMT=28.3); vaccine C (20/28, GMT=28.3); vaccine D (14/30, GMT=16.1); and against BVDV-2: vaccine A (12/12, GMT=56.6); vaccine B (18/36, GMT=16.8); vaccine C (10/28, GMT=21.6) and vaccine D (6/30, GMT=16.1). The geometric mean titers (GMTs) induced by vaccine A were significantly higher than those induced by the other vaccines (BVDV-1: P<0.0001) and (BVDV-2: P=0.01) in all days of testing. Cross-neutralization tests revealed that the antibodies induced by vaccine A cross-reacted to higher titers also with three Brazilian BVDV-1 and one BVDV-2 isolates. These results demonstrate that the experimental attenuated vaccine induced neutralizing antibodies in higher titers, duration and spectrum of reactivity than those induced by commercial vaccines. This vaccine may represent a future alternative for the control of BVDV infection in Brazil.

Keywords : bovine viral diarrhea virus; BVDV; vaccines.

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