Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5545403 | Veterinary Microbiology | 2017 | 4 Pages |
Abstract
Forty PRRS-negative, three week-old weaned pigs were randomized into two groups in separate rooms and inoculated with a modified live PRRS vaccine (Fostera® PRRS) or control (PBS). Four weeks after vaccination pigs were rehoused in a single room and challenged intranasally and intramuscularly with virulent PRRSV strain NADC20. Timed serum samples were collected and titrated for PRRS virus and anti-PRRS virus antibodies. The study concluded when â¥80% of the pigs in the control group were determined to be virus negative (27 days post-challenge). Mean duration of viremia was significantly lower (p = 0.0327) for vaccinated pigs compared to non-vaccinated pigs. A significant reduction (p â¤Â 0.0053) in mean post-challenge viremia titer was seen in vaccinates compared to non-vaccinates from days 8 through 22 post-challenge. At the individual pig level, no pigs in the vaccinated group had detectible PRRSV in serum at the end of the study (27 days post-challenge), while 15% of non-vaccinated pigs remained positive for virus.
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Authors
Jay G. Calvert, Marcia L. Keith, Douglas S. Pearce, M. Corinne Lenz, Vickie L. King, Yvette A. Diamondidis, Robert G. Ankenbauer, Nathalie C. Martinon,