Evaluation of shedding of bovine herpesvirus 1, bovine viral diarrhea virus 1, and bovine viral diarrhea virus 2 after vaccination of calves with a multivalent modified-live virus vaccine.
OBJECTIVE
To determine whether bovine herpesvirus 1 (BHV1), bovine viral diarrhea (BVDV) virus 1 (BVDV1), or BVDV 2 (BVDV2) were shed after parenteral administration of a multivalent modified-live virus vaccine.


METHODS
Prospective study.


METHODS
28 healthy beef calves and 4 healthy pregnant beef cows.


METHODS
A commercially available modified-live virus multivalent vaccine was administered to steers and heifers (n = 18) that were seronegative to BHV1, BVDV1, and BVDV2. Four seronegative pregnant control cows were held in contact with the vaccinated calves for 103 days. Unvaccinated calves (n = 10) were held as controls in a separate double-fenced pen. Seroconversion was monitored by determining serum neutralization titers after vaccination. Viral shedding and viremia were assessed via analysis of nasal swab specimens and blood by use of polymerase chain reaction (PCR) and reverse transcriptase-PCR assays and virus isolation.


RESULTS
A transient BVDV1 viremia was detected in most vaccinated calves 3 to 10 days after vaccination. All vaccinated calves seroconverted to BVDV1 and BVDV2. Seventeen of 18 vaccinated calves seroconverted to BHV1. Viral shedding was not detected in the vaccinated calves. All control cattle remained seronegative to BHV1, BVDV1, and BVDV2 throughout the study.


CONCLUSIONS
Shedding of BHV1, BVDV1, and BVDV2 after vaccination was either nonexistent or undetected and did not result in transmission of BHV1, BVDV1, or BVDV2 vaccine viruses to pregnant contact control cows.
Kleiboeker
Steven B
SB
Department of Veterinary Pathobiology and the Veterinary Medical Diagnostic Laboratory, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211, USA.
Lee
Sang-Myeong
SM
Jones
Craig A
CA
Estes
D Mark
DM
D000818:Animals; D001912:Bovine Virus Diarrhea-Mucosal Disease / Q000097:blood / Q000517:prevention & control*; D002417:Cattle; D002418:Cattle Diseases / Q000097:blood / Q000517:prevention & control*; D030241:Diarrhea Virus 1, Bovine Viral / Q000276:immunology / Q000302:isolation & purification; D030242:Diarrhea Virus 2, Bovine Viral / Q000276:immunology / Q000302:isolation & purification; D005260:Female; D006566:Herpesviridae Infections / Q000097:blood / Q000517:prevention & control / Q000662:veterinary*; D007242:Herpesvirus 1, Bovine / Q000276:immunology / Q000302:isolation & purification; D008297:Male; D016133:Polymerase Chain Reaction / Q000662:veterinary; D011247:Pregnancy; D011446:Prospective Studies; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000662:veterinary; D012698:Serologic Tests / Q000662:veterinary; D014765:Viral Vaccines / Q000008:administration & dosage*; D017201:Virus Shedding
D014765:Viral Vaccines