Study supports saline for T. foetus RT-rtPCR transport

A new study in the Journal of Veterinary Diagnostic Investigation found that 0.9% sterile saline was noninferior to phosphate-buffered saline, or PBS, as a transport medium for Tritrichomonas foetus RT-rtPCR testing in bovine preputial wash samples at the assay’s reported limit of detection. In the trial, researchers tested samples across 10 weeks and found no significant medium effect on cycle threshold values; the normalized mean Ct difference between PBS and saline was 0.19, and saline met the study’s predefined noninferiority margin. The practical shift is straightforward: a fluid commonly stocked in bovine practice performed comparably to a lab-oriented transport medium for this assay. (pmc.ncbi.nlm.nih.gov)

Why it matters: For veterinary professionals, especially those collecting field samples for bovine trichomonosis surveillance, the finding could make sampling logistics easier without sacrificing analytical performance. The authors note they found no prior published reports validating saline for this specific RT-rtPCR use case, even though some diagnostic laboratories already accept saline-submitted samples for PCR. That matters because T. foetus testing decisions affect herd fertility management, movement, and regulatory programs, and simpler collection protocols can improve compliance and turnaround in real-world practice. (pmc.ncbi.nlm.nih.gov)

What to watch: Watch for whether more veterinary diagnostic labs, state animal health programs, and submission guidelines formally expand or standardize saline as an accepted transport option for direct T. foetus RT-rtPCR testing. (agri.nv.gov)