Antibody titers to pseudorabies virus in piglets immunized with gIII deleted pseudorabies vaccine in a pseudorabies infected herd.
The decrease in titer of PRV antibodies in serum was evaluated at 10, 37, 67, 109 and 173 days of age in 16 non-vaccinated pigs and 43 pigs vaccinated at 3, 67 and 80 days of age with a modified live TK/gIII gene deleted pseudorabies virus (PRV) vaccine. Serum samples were analyzed for antibodies to PRV by the serum-virus neutralization test (SN), a commercial competitive ELISA (CELISA), and the CELISA OMNIMARK PRV differential (OMD) diagnostic kit. At 10 days of age, all pigs had SN titers > or = 1:4 and were CELISA+/OMD+, indicating circulating antibodies to field strains of PRV. At 109 days, all non-vaccinated pigs had SN titers < 1:4. Forty-five percent of vaccinated pigs had SN titers > or = 1:4, 56% were CELISA positive and most were CELISA+/OMD-, indicating antibodies due to vaccination. At 24 weeks of age, all pigs had SN titers > or = 1:4 and were CELISA+/OMD+ due to exposure to field strains. Although circulating maternal antibodies interfere with the development of active immunity, vaccination at 3 days of age resulted in detectable antibodies by 67 days of age, and a limited immune response could be measured at 109 days of age.
Elvinger
F
F
Veterinary Diagnostic and Investigational Laboratory, University of Georgia, Tifton 31793.
Reeves
D E
DE
Pursell
A R
AR
Cole
J R
JR
Liauw
H
H
D000818:Animals; D000831:Animals, Newborn; D000914:Antibodies, Viral / Q000097:blood*; D005260:Female; D011558:Herpesvirus 1, Suid / Q000276:immunology*; D007112:Immunity, Maternally-Acquired / Q000276:immunology; D011557:Pseudorabies / Q000276:immunology* / Q000517:prevention & control; D022421:Pseudorabies Vaccines; D013552:Swine; D013553:Swine Diseases / Q000276:immunology* / Q000517:prevention & control; D013997:Time Factors; D014613:Vaccines, Attenuated / Q000008:administration & dosage / Q000276:immunology; D014765:Viral Vaccines / Q000008:administration & dosage* / Q000276:immunology
D000914:Antibodies, Viral; D022421:Pseudorabies Vaccines; D014613:Vaccines, Attenuated; D014765:Viral Vaccines