Study flags shared BVDV circulation in cattle and buffalo herds

A new Preventive Veterinary Medicine study points to a more complicated BVDV ecology in South Asia’s mixed-herd production systems, with cattle and water buffalo in Bangladesh carrying genetically related, co-circulating pestiviruses rather than clearly separated viral populations. Based on 219 blood samples from 12 mixed herds, the study identified a high prevalence of infection and the presence of BVDV-1, BVDV-2, and HoBi-like virus, underscoring how commingled species may sustain multiple viral lineages at once. (researchonline.jcu.edu.au)

That matters because BVDV control programs have historically been built around cattle, even though buffalo have been implicated in infection and persistence for years. Earlier molecular work in buffalo sharing habitat with cattle found evidence of persistent infection and natural coinfection with both BVDV-1 and BVDV-2, while Bangladesh researchers previously reported the rare HoBi-like pestivirus circulating in cattle. More recent national surveillance from Bangladesh suggests BVDV exposure is already widespread in dairy herds, with herd-level seroprevalence above 70% in one 2025 report, and no national control or vaccination program currently in place. (sciencedirect.com)

The new study’s core contribution is molecular characterization in a real-world mixed-species setting. According to the abstract, researchers detected co-circulation of multiple genotypes in cattle and buffalo, including HoBi-like virus alongside BVDV-1 and BVDV-2. The “genetically related” finding is especially important because it supports the inference that transmission is occurring across species within shared production environments, not simply in parallel within separate host groups. That aligns with broader BVDV epidemiology showing herd-level spread is strongly shaped by animal contact, herd structure, and the presence of persistently infected animals that shed virus continuously. (sciencedirect.com)

The HoBi-like signal adds another layer. HoBi-like pestiviruses, sometimes referred to as BVDV-3 or Pestivirus H, have been reported in cattle and buffalo in Asia, South America, and Europe, and they can complicate both surveillance and control. Published work has warned that standard BVDV testing may have reduced sensitivity for HoBi-like strains, and experimental and field studies have shown that failure to detect HoBi-like persistently infected animals could undermine eradication efforts. In Bangladesh specifically, the presence of HoBi-like virus has been documented before, so the new paper fits into a growing picture of more diverse pestivirus circulation than many field protocols may account for. (sciencedirect.com)

Expert guidance from the American College of Veterinary Internal Medicine continues to emphasize the same basic control principle: persistently infected animals are the engine of BVDV maintenance in herds. That principle likely applies even more forcefully in mixed-herd systems if buffalo are participating in the same transmission web as cattle. Prior buffalo studies have already demonstrated persistent infection and mixed infection in serologically negative animals, suggesting that relying on serology alone could miss epidemiologically important cases. (academic.oup.com)

Why it matters: For veterinarians, herd health consultants, and production animal practices, the study is a reminder that species boundaries on paper may not reflect transmission boundaries on farms. In regions where cattle and buffalo are raised together, BVDV control plans may need to include both species in testing, PI-animal searches, movement decisions, and biosecurity design. It also reinforces the need to understand which pestivirus species and subtypes are actually circulating locally before making assumptions about diagnostic fit or vaccine coverage, particularly where HoBi-like viruses are in play. (journals.sagepub.com)

There doesn’t appear to be a separate institutional press release or public expert reaction tied specifically to this paper in the sources reviewed, but the surrounding literature is consistent: mixed-species systems can create blind spots for BVDV surveillance, and emerging or atypical pestiviruses can weaken standard control approaches if they aren’t actively looked for. That makes this study less of an isolated finding than a useful field signal for countries with commingled cattle-buffalo production. (sciencedirect.com)

What to watch: The next questions are whether follow-up studies identify persistently infected buffalo at meaningful rates, whether national or regional labs validate routine assays against HoBi-like strains, and whether control guidance in endemic markets starts to explicitly address mixed-herd surveillance rather than cattle-only programs. (journals.asm.org)