Detection of equid alphaherpesvirus 1 in serum samples collected from infected horses.

The research investigates the detection of Equid alphaherpesvirus 1 (EqAHV1) in horse’s serum samples via Real-Time Polymerase Chain Reaction (rtPCR) test, disputing the traditional belief that these serum samples do not contain enough data for EqAHV1 detection.

Objective and Methodology

• The research outlines its primary objective to ascertain whether EqAHV1 can be detected in equine serum samples using highly sensitive detection methods, such as rtPCR.
• The researchers performed the rtPCR on stored serum and PBMCs (Peripheral Blood Mononuclear Cells) from three horses that were deliberately infected with EqAHV1. This methodology aimed to discover the presence of the virus in the bloodstream of the infected horses.
• Further, their investigation also included testing serum from 40 febrile horses, out of which 11 were already confirmed to be EqAHV1 positive based on antibody ELISA testing. The researchers ran both standard rtPCR and direct rtPCR without nucleic acid purification on these samples.

Findings

• EqAHV1 was detected in the PBMCs of the three intentionally infected horses for 3-6 days and in their serum for 5-7 days, as revealed by standard rtPCR.
• The findings reported a scenario of mixed outcomes with the 11 ELISA-positive samples. Six of them showed positive results on standard rtPCR, while the remaining did not. Further, all six positive standard rtPCR samples tested positive again when put through direct rtPCR.

Conclusion

• The research concluded that despite common belief, serum samples can be utilized to detect EqAHV1.
• However, it was also noted that due to a low viral gene copy number in the samples, there could be a risk of false negatives. This implicates that additional testing or refined methods might be necessary to accurately detect the presence of the virus in the serum samples.