Study flags shared BVDV circulation in cattle and buffalo herds

Bovine viral diarrhea virus may be moving more freely between cattle and water buffalo in Bangladesh’s mixed-herd systems than many control plans assume. In a cross-sectional study of 219 blood samples from cattle and water buffalo across 12 mixed herds, researchers found a high burden of infection and the co-circulation of multiple pestivirus genotypes, including BVDV-1, BVDV-2, and HoBi-like virus, with genetically related strains detected across both species. That finding suggests mixed production systems can support shared viral circulation rather than separate, species-specific transmission cycles. Earlier work from Bangladesh had already identified HoBi-like pestivirus in cattle, and newer surveillance studies indicate BVDV is broadly endemic in the country’s dairy sector, where no national BVDV control or vaccination program is in place. (ovid.com)

Why it matters: For veterinary professionals, the paper adds molecular evidence to a practical concern: buffalo may not just be incidental spillover hosts, but part of the same transmission network as cattle in commingled herds. That raises the stakes for surveillance, because BVDV control depends on finding and removing persistently infected animals, and diagnostic strategies built mainly around cattle may miss or undercount infection in buffalo, especially where HoBi-like viruses are present. Consensus guidance on BVDV emphasizes that persistently infected animals are central to herd-level maintenance of infection, and prior studies have shown water buffalo can carry persistent infection and even mixed BVDV infections. (academic.oup.com)

What to watch: Watch for follow-up work on persistently infected buffalo, assay performance against HoBi-like strains, and whether Bangladesh or neighboring markets move toward species-inclusive BVDV surveillance in mixed herds. (journals.asm.org)