AI Summary & Key Takeaways
AI InsightThis studyindicated that cross-protective immune responses with the most common international BVDV vaccine strains need to be evaluated withchallenge experiments against field strains for efficient protection.
📌 3 Key Takeaways
Abstract
Modified killed vaccines against bovine viral diarrhea virus (BVDV) are used worldwide. In the present study, the crossneutralizationantibody responses against field strains from seven subgenotypes of BVDV-1 and one subgenotype of BVDV-2 wereevaluated using sera obtained by three inactivated commercial vaccines. One vaccine contained both BVDV-1 and BVDV-2 strains,while the others contained only BVDV-1a. Three vaccine groups, each containing five calves, were vaccinated two times with 30-day intervals. The antibody titers were evaluated by virus neutralization assay. The monovalent vaccine induced the highest antibodytiters. Significant levels of neutralizing antibody titers were maintained up to the last sampling time. Although one vaccine containedthe BVDV-2 strain, the lowest antibody titers were detected against field strains from BVDV-2, BVDV-1b, and BVDV-1r. This studyindicated that cross-protective immune responses with the most common international BVDV vaccine strains need to be evaluated withchallenge experiments against field strains for efficient protection.