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. 2024 Mar 1;12(3):257. doi: 10.3390/vaccines12030257

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© 2024 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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PRRSV antibody responses after intramuscular (IM) or intradermal (ID) MLV vaccination in 3-week-old piglets originating from either PRRSV vaccinated, seropositive sows (E+ piglets) or PRRSV vaccinated, seronegative/slightly seropositive sows (E− piglets). Results are shown as S/p values assessed by a commercial PRRS ELISA kit. The cut-off value of seropositivity (S/p ≥ 0.4) is indicated with a dotted line. Full connecting lines and green dots at 3 wpv represent piglets that showed an antibody response after PRRSV vaccination; dotted connecting lines and red dots at 3 wpv represent piglets without an antibody response after PRRSV vaccination.