Using commercial ELISAs to assess humoral response in sows repeatedly vaccinated with modified live porcine reproductive and respiratory syndrome virus
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Author
Díaz, Ivan
Genís-Jorquera, Blanca
Martín-Valls, Gerard E.
Mateu, Enric
Publication date
2019-10-01ISSN
0042-4900
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.
Document Type
Article
Document version
Accepted version
Language
English
Subject (CDU)
619 - Veterinary science
Pages
14
Publisher
BMJ Publishing Group
Is part of
Veterinary Record
Citation
Díaz, Ivan, Blanca Genís-Jorquera, Gerard E Martín-Valls, and Enric Mateu. 2019. "Using Commercial Elisas To Assess Humoral Response In Sows Repeatedly Vaccinated With Modified Live Porcine Reproductive And Respiratory Syndrome Virus". Veterinary Record 186 (4): 123-123. BMJ. doi:10.1136/vr.105432.
Program
Sanitat Animal
This item appears in the following Collection(s)
- ARTICLES CIENTÍFICS [2831]
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by-nc/4.0/