AI Article Synopsis
- Sows in breeding herds are frequently vaccinated against PRRS using modified live vaccines (MLV); however, many vaccinated sows show negative results in ELISA tests, creating uncertainty about their vaccination status.
- The study tested gilts and sows from three farms using four different ELISAs before and after vaccination, also assessing total and neutralizing antibodies and cell-mediated responses in those with negative results.
- Results indicated variability in seronegative animals depending on the farm and ELISA, revealing that the effectiveness of ELISA for monitoring vaccinated sows is limited due to differing immune responses across tests.
Article Abstract
Background: Sows in breeding herds are often mass vaccinated against porcine reproductive and respiratory syndrome (PRRS) every few months using modified live vaccines (MLV). Field veterinarians repeatedly report that multiple vaccinated sows test negative in ELISA. Obviously, this creates uncertainty when assessing the compliance of vaccination and the status of sows.
Methods: In the present study, four commercial ELISAs were used to assess the serological PRRS status in gilts and sows of three farms that were PRRS MLV vaccinated every four months. Animals were tested before vaccination (BV) and postvaccination (PV). Total and neutralising antibodies and cell-mediated responses were also measured in animals that yielded negative results in all ELISAs.
Results: The proportion of seronegative animals BV varied depending on the farm and the ELISA used. When samples were analysed using only one ELISA, a substantial number of negative results obtained BV remained as negative afterwards. Five animals were negative BV and PV with all the examined ELISAs. Those animals also yielded negative results in all the other immunological assays.
Conclusion: Our findings suggest that the use of ELISA for monitoring multiple PRRS MLV vaccinated sows is very limited due to the variability of the humoral responses and the moderate agreement between tests.
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| http://dx.doi.org/10.1136/vr.105432 | DOI Listing |
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