Study finds zoonotic microsporidia in Hu sheep and goats in Zhejiang

A newly published study in Veterinary Sciences reports endemic circulation of Enterocytozoon bieneusi in Hu sheep and goats in southern Zhejiang Province, China, with Hu sheep showing a significantly higher infection prevalence than nearby goats. Across 297 fecal samples collected between 2021 and 2023, the overall prevalence was 18.18%, including 24.53% in Hu sheep and 10.87% in goats. The paper is notable because it fills what the authors describe as a complete data gap for Hu sheep and offers the first parallel comparison of sympatric sheep and goat populations in this part of eastern China. (mdpi.com)

That matters because E. bieneusi sits at the intersection of herd health, occupational exposure, and public health. The organism is a microsporidian pathogen associated with human microsporidiosis, and U.S. NIH guidance notes that E. bieneusi is linked to gastrointestinal disease, including diarrhea and cholangitis, particularly in people with significant immune suppression. Reviews of the literature have also consistently described domestic animals as important contributors to transmission ecology, whether through direct contact, manure, or contaminated water. (clinicalinfo.hiv.gov)

The Zhejiang study used nested PCR targeting the ITS region and found a genotype mix that included established small-ruminant strains and genotypes with zoonotic implications. MDPI’s article summary states that the findings support breed-specific on-farm biosecurity strategies and mitigation of public health risk in the region. Search excerpts from the paper indicate that genotypes detected included BEB6, CHG1, CHG3, CYG-2, CM7, and Type IV, with variation by age group and host species. Some of these, such as CHG3 and CHG1, are repeatedly reported in Chinese goat and sheep studies, while others like Type IV have a clearer history of zoonotic concern. (mdpi.com)

The broader epidemiologic backdrop reinforces that this is not an isolated signal. A global systematic review and meta-analysis found that China accounts for the largest body of molecular prevalence data in sheep and goats, with a pooled prevalence of 17.9% in the Chinese datasets included, very close to the prevalence reported in this new southern Zhejiang work. A 2024 Zhejiang study in cattle and goats also found ongoing circulation of E. bieneusi genotypes in regional livestock, suggesting that exposure pathways may extend beyond a single host species or production system. (pmc.ncbi.nlm.nih.gov)

There is also a suggestive human-health connection in the same geography. A 2026 study identified E. bieneusi in diarrheal and asymptomatic children in southern Zhejiang Province, indicating that the pathogen is present in both animal and human populations in the region. That does not prove transmission from sheep or goats to people in this study, but it does strengthen the One Health rationale for integrated surveillance, especially where livestock, people, and shared water sources are in close contact. (pubmed.ncbi.nlm.nih.gov)

Why it matters: For veterinarians, this paper is most useful as a surveillance and risk-management signal. Small-ruminant practitioners may not see overt clinical disease attributed to E. bieneusi on every farm, but the organism’s zoonotic relevance, environmental persistence, and genotype diversity make it important in herd health planning. The higher prevalence in Hu sheep than goats also suggests that species, breed, management, age structure, or housing could shape risk in ways worth investigating on mixed farms. Advising producers on fecal hygiene, runoff control, worker protection, and diagnostic follow-up in diarrheal investigations remains the practical takeaway. (mdpi.com)

Industry reaction appears limited so far, which is common for narrowly focused molecular surveillance papers, and no separate institutional press release was readily visible in search results. Still, the study aligns with a steady stream of Chinese and international literature arguing that E. bieneusi surveillance in domestic ruminants deserves more attention, particularly where zoonotic genotypes recur across host species. (mdpi.com)

What to watch: The next step is whether researchers can link animal, environmental, and human isolates through shared genotypes in southern Zhejiang, and whether future work identifies actionable farm-level risk factors that would justify targeted screening or revised biosecurity guidance for small-ruminant operations. (mdpi.com)