Detection of antibodies to structural proteins of foot-and-mouth disease virus in swine meat juice.

Established test methods for detecting foot-and-mouth disease virus (FMDV) rely on sample collection from live animals. However, circumstances exist in which it is not possible to collect the desired samples. Meat juice has been explored as an alternative for the detection of FMDV and has previously proven successful by real-time reverse transcription polymerase chain reaction and lateral flow strip test. Meat juice has not yet been assessed for the detection of antibodies to FMDV. This study, therefore, evaluated meat juice for the detection of antibodies to structural proteins by existing serotype-specific solid phase competitive enzyme-linked immunosorbent assays. Antibodies to FMDV structural proteins were detected in meat juice from experimentally infected pigs beginning 6- or 7-days post-infection (DPI) and continued until 21 to 28 DPI. Sera were tested in tandem and followed similar antibody detection patterns. The results show that meat juice can be used for detection of anti- FMDV structural protein antibodies.

Les méthodes diagnostiques établies pour détecter le virus de la fièvre aphteuse (FMDV) reposent sur le prélèvement d'échantillons sur des animaux vivants. Cependant, il existe des circonstances lors desquelles il n'est pas possible de prélever les échantillons souhaités. Le jus de viande a été exploré comme alternative pour la détection du FMDV et s'est déjà avéré efficace par la réaction d'amplification en chaîne par la polymérase en temps réel avec la transcriptase inverse et par test d'immunochromatographie. Le jus de viande n'a pas encore été évalué pour la détection d'anticorps anti-FMDV. Cette étude a donc évalué le jus de viande pour la détection des anticorps contre les protéines structurelles par des tests immuno-enzymatiques compétitifs en phase solide spécifiques au sérotype existants. Des anticorps contre les protéines structurales du FMDV ont été détectés dans le jus de viande de porcs infectés expérimentalement à partir de 6 ou 7 jours après l'infection (DPI) et se sont poursuivis jusqu'à 21 à 28 DPI. Les sérums ont été testés en tandem et ont suivi des schémas de détection d'anticorps similaires. Les résultats montrent que le jus de viande peut être utilisé pour la détection des anticorps anti-protéine structurale du FMDV.(Traduit par Docteur Serge Messier).

Detection of Foot-and-Mouth Disease Virus in Swine Meat Juice.

Foot-and-mouth disease virus (FMDV) is a highly contagious agent that impacts livestock industries worldwide, leading to significant financial loss. Its impact can be avoided or minimized if the virus is detected early. FMDV detection relies on vesicular fluid, epithelial tags, swabs, serum, and other sample types from live animals. These samples might not always be available, necessitating the use of alternative sample types. Meat juice (MJ), collected after freeze-thaw cycles of skeletal muscle, is a potential sample type for FMDV detection, especially when meat is illegally imported. We have performed experiments to evaluate the suitability of MJ for FMDV detection. MJ was collected from pigs that were experimentally infected with FMDV. Ribonucleic acid (RNA) was extracted from MJ, sera, oral swabs, and lymph nodes from the same animals and tested for FMDV by real-time reverse transcription polymerase chain reaction (rRT-PCR). MJ was also tested for FMDV antigen by Lateral Flow Immunoassay (LFI). FMDV RNA was detected in MJ by rRT-PCR starting at one day post infection (DPI) and as late as 21 DPI. In contrast, FMDV RNA was detected in sera at 1-7 DPI. Antigen was also detected in MJ at 1-9 DPI by LFI. Live virus was not isolated directly from MJ, but was recovered from the viral genome by transfection into susceptible cells. The data show that MJ is a good sample type for FMDV detection.