Prevalence and molecular epidemiology of the novel equine parasite Theileria haneyi in China.
Authors: Yang Guangpu, Chen Yongyan, Chen Kewei, Hu Zhe, Li Jingkun, Wang Jingfei, Guo Wei, Wang Xiaojun, Du Cheng
Journal: Equine veterinary journal
Summary
# Editorial Summary: Theileria haneyi in Chinese Equine Populations Equine piroplasmosis represents a significant production and welfare concern across the equine industry, traditionally attributed to *Theileria equi* and *Babesia caballi*, though a recently characterised third pathogen, *Theileria haneyi*, has emerged globally with unclear prevalence and epidemiological significance in many regions. Yang and colleagues conducted a molecular survey across Chinese equine populations to establish baseline prevalence data and characterise the genetic diversity of *T. haneyi* using PCR and sequencing methodologies, filling a notable gap in our understanding of this emerging pathogen's distribution in Asia. The research identified *T. haneyi* infection in Chinese horses at frequencies warranting clinical attention, with phylogenetic analysis revealing genetic variants distinct from previously documented international strains, suggesting either locally adapted parasite populations or multiple introduction events. These findings carry important implications for diagnostic protocols and disease management strategies in endemic regions, particularly given that current serological and molecular screening may not consistently identify all variants, and mixed infections with classical EP pathogens appear likely in some populations. Practitioners in endemic or importing-from-China regions should consider *T. haneyi* in differential diagnoses of pyroplasmic disease and discuss testing protocols with diagnostic laboratories to ensure adequate pathogen coverage in screening programmes.
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Practical Takeaways
- •Veterinarians in China should be aware that equine piroplasmosis may now include T. haneyi as a causative agent, requiring updated diagnostic protocols beyond traditional T. equi and B. caballi screening
- •Tick control and disease surveillance programs should be adapted to account for this newly identified pathogen affecting the equine industry in China
- •Consider T. haneyi in differential diagnosis for horses presenting with clinical signs consistent with piroplasmosis in Chinese populations
Key Findings
- •Theileria haneyi is a newly identified pathogen causing equine piroplasmosis alongside T. equi and B. caballi
- •T. haneyi has global distribution but had not been previously reported in China prior to this study
- •Epidemiological patterns of T. haneyi in China remain to be defined through this investigation