Study points to localized CCHFV circulation in Central Kazakhstan

A new study suggests Crimean-Congo hemorrhagic fever virus, or CCHFV, may be circulating in Central Kazakhstan, not just in the country’s better-known southern endemic zones. In research published in Frontiers in Veterinary Science, investigators reported molecular, serologic, and virologic evidence from Karaganda and Ulytau, including a PCR-positive tick pool, eight seropositive livestock samples, successful virus isolation, and phylogenetic characterization of an Asia-2 genotype isolate. (frontiersin.org)

That matters because Kazakhstan has long recognized CCHF risk primarily in southern regions such as Zhambyl, Turkestan, Kyzylorda, and Shymkent, where recurrent human cases and tick circulation have been documented. The new paper argues that pasture-based livestock systems, seasonal animal movement, and ecological conditions favorable to ixodid ticks could help support interregional spread or local maintenance farther north and west than the traditional map suggests. Earlier CDC reporting from Kazakhstan also found that CCHFV activity can show up in villages where the disease had not been officially reported before, reinforcing the value of One Health surveillance rather than relying only on known endemic boundaries. (frontiersin.org)

The study design was targeted and field-based. Researchers collected 700 whole-blood and 700 serum samples from cattle and small ruminants, along with 127 ticks, during the spring-summer 2025 season in the Shet, Aktogay, Ulytau, and Zhanaarka districts, plus Zhezkazgan, Satpayev, and Karazhal. Livestock blood samples were negative for viral RNA, but one of eight tick pools from the Mibulak rural district was RT-qPCR positive. Eight serum samples carried anti-CCHFV IgG antibodies, with four from the same locality, suggesting prior exposure in at least one focal area. The team then isolated virus in cell culture and found that the S segment of isolate CCHF/2025/Mibulak/KZ clustered within the Asia-2 genotype, closely related to strains previously reported from Kazakhstan, China, and Uzbekistan. (frontiersin.org)

The broader epidemiology fits what international animal and public health agencies already warn about. WHO says animals such as cattle, sheep, and goats can become infected without obvious illness, while the virus continues cycling between ticks and vertebrate hosts. FAO similarly notes that livestock often carry CCHFV without appearing sick, making field detection difficult. CDC and Merck both emphasize that veterinarians and others working in close contact with livestock face elevated exposure risk, especially through tick bites or contact with infected blood and tissues. (who.int)

There does not appear to be a separate institutional press release or a broad wave of public expert commentary tied specifically to this paper, but the study’s conclusions align with existing regional lessons. CDC’s One Health reporting from Kazakhstan found that only a minority of people interviewed used protective equipment during high-risk animal activities such as slaughter, and that officials planned expanded testing of ticks, people, and livestock after finding evidence of circulation outside expected areas. That history gives this new Central Kazakhstan signal practical weight, even though the sample-level detection in the paper is limited. (cdc.gov)

Why it matters: For veterinary teams, this is less about animal clinical disease and more about surveillance, occupational safety, and early warning. CCHFV is typically subclinical in livestock, so absence of illness doesn’t mean absence of risk. A positive tick pool plus livestock seropositivity can be enough to justify stronger tick-control programs, more deliberate PPE use during handling and slaughter-related work, and closer coordination with public health partners. In mixed animal systems with pasture movement, veterinarians may be among the first professionals to notice changing tick burdens, unusual geographic spread, or gaps in producer awareness. (frontiersin.org)

The study also underscores the value of integrated methods. PCR on animal blood alone would have missed the signal here. It was the combination of tick surveillance, livestock serology, virus isolation, and sequencing that built the case for localized circulation. For veterinary surveillance programs, that’s an important operational point: if CCHFV is a concern, single-stream testing may undercall risk in apparently healthy herds and flocks. (frontiersin.org)

What to watch: The next step is whether Kazakhstan or research partners scale up follow-on surveillance in Ulytau and adjacent regions, add more seasonal sampling, or connect veterinary findings to human case detection and tick-control policy. If additional isolates are recovered or more seropositive clusters emerge, Central Kazakhstan may need to be treated less as a peripheral risk area and more as an active surveillance zone. (frontiersin.org)