phaidra.vetmeduni.ac.at o:4397 DOI 10.1186/s40813-024-00370-0 Detection of PRRSV-1 in tongue fluids under experimental and field conditions and comparison of different sampling material for PRRSV sow herd monitoring Infection with porcine reproductive and respiratory syndrome virus (PRRSV) leads to significant economic losses worldwide. One of the initial measures following an outbreak is to stabilise the herd and to prevent vertical transmission of PRRSV. The objective of this study was to detect PRRSV in different sampling material, both in an experimental model and on a commercial piglet producing farm, with a focus on evaluating the suitability of tongue fluid samples.In the experimental model, PRRSV negative pregnant gilts were infected with PRRSV-1 AUT15-33 on gestation day 85 and necropsy of gilts and foetuses was performed three weeks later. 38.3% of individual foetal serum and 39.4% of individual foetal thymus samples were considered PRRSV RT-qPCR positive. Tongue fluids from individual foetuses showed a 33.0% positivity rate. PRRSV RNA was detected in all but one sample of litter-wise pooled processing fluids and tongue fluids. In the field study, the investigated farm remained PRRSV positive and unstable for five consecutive farrowing groups after the start of the sampling process. Tongue fluid samples pooled by litter in the first investigated farrowing group had a 54.5% positivity rate, with the overall highest viral load obtained in the field study. In this farrowing group, 33.3% of investigated litter-wise pooled processing fluid samples and all investigated serum samples (pools of 4-6 individuals, two piglets per litter) were considered positive. Across all investigated farrowing groups, tongue fluid samples consistently showed the highest viral load. Moreover, tongue fluid samples contained the virus in moderate amounts for the longest time compared to the other investigated sampling material.It can be concluded that the viral load in individual foetuses is higher in serum or thymus compared to tongue fluid samples. However, litter-wise pooled tongue fluid samples are well-suited for detecting vertical transmission within the herd, even when the suspected prevalence of vertical transmission events is low. eng Porcine Reproductive And Respiratory Syndrome Virus PRRSV AUT15-33 Vertical Transmission Reproductive Model Processing Fluids Tongue Tissue Tongue Fluids 2025-08-21T08:41:06.917Z LOMv1.0 Author BEGIN:VCARD VERSION:3.0 N:Dürlinger;Sophie; FN:Sophie Dürlinger END:VCARD BEGIN:VCARD VERSION:3.0 N:Kreutzmann;Heinrich; FN:Heinrich Kreutzmann X-ORCID:https://orcid.org/0000-0002-6010-697X END:VCARD BEGIN:VCARD VERSION:3.0 N:Unterweger;Christine; FN:Christine Unterweger X-ORCID:https://orcid.org/0000-0003-4965-2088 END:VCARD BEGIN:VCARD VERSION:3.0 N:Martin;Vera; FN:Vera Martin END:VCARD BEGIN:VCARD VERSION:3.0 N:Hamar;Flora; FN:Flora Hamar END:VCARD BEGIN:VCARD VERSION:3.0 N:Knecht;Christian; FN:Christian Knecht END:VCARD BEGIN:VCARD VERSION:3.0 N:Auer;Angelika; FN:Angelika Auer END:VCARD BEGIN:VCARD VERSION:3.0 N:Dimmel;Katharina; FN:Katharina Dimmel X-ORCID:https://orcid.org/0009-0003-8320-4286 END:VCARD BEGIN:VCARD VERSION:3.0 N:Rümenapf;Till; FN:Till Rümenapf X-ORCID:https://orcid.org/0000-0002-2951-7471 END:VCARD BEGIN:VCARD VERSION:3.0 N:Griessler;Alfred; FN:Alfred Griessler END:VCARD BEGIN:VCARD VERSION:3.0 N:Voglmayr;Thomas; FN:Thomas Voglmayr END:VCARD BEGIN:VCARD VERSION:3.0 N:Maurer;Roland; FN:Roland Maurer END:VCARD BEGIN:VCARD VERSION:3.0 N:Oppeneder;Alexander; FN:Alexander Oppeneder END:VCARD BEGIN:VCARD VERSION:3.0 N:Ladinig;Andrea; FN:Andrea Ladinig X-ORCID:https://orcid.org/0000-0001-5037-7269 END:VCARD https://w3id.org/kim/hcrt/scheme https://w3id.org/kim/hcrt/text Textdokument Text LOMv1.0 yes https://creativecommons.org/licenses/by/4.0 application/pdf 862867 https://phaidra.vetmeduni.ac.at/o:4397 https://phaidra.vetmeduni.ac.at/api/object/o:4397/thumbnail LOMv1.0 discipline