Using vaccination and unidirectional pig flow to control PRRSV transmission
Scott A Dee, DVM, PhD, Dipl; ACVM; Reid Philips, DVM
Complete article is available online.
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Objective: To assess the effectiveness of a new protocol for thecontrol of PRRSV spread in an infected finishing pig population.
Methods: PRRS vaccine was administered and unidirectional pigflow was used in a finishing pig unit to establish a noninfected population.After the protocol was completed, seronegative nursery pigs were introducedto the facility on a monthly basis, and their serostatus was monitored overa 4-month period. Previously infected and/or vaccinated pigs co-existedin the same airspace throughout the study.
Results: A seronegative finishing pig population was establishedover time after we marketed infected pigs and then introduced seronegativestock. One hundred percent (120 of120) of the samples collected after thestudy was completed were seronegative according to the indirect-fluorescentantibody test.
Implications: This control protocol may provide an option to controland potentially eliminate PRRSV from segregated finishing populations anddoes not require complete depopulation of the facility.