Coccidiosis in Dairy Cattle: Research Reveals New Insights into Eimeria Species Distribution in China

Strategic Insights -

Researchers at Henan Agricultural University have published a new report on the epidemiology and species distribution of Eimeria spp. in key dairy-producing regions of China. The study revealed that coccidiosis is a prevalent disease affecting dairy cattle globally, imposing significant economic losses on the dairy industry annually. To better understand the distribution of Eimeria spp., the researchers developed an integrated approach combining morphological characterization with single-oocyst selection technology and multi-locus-nested PCR amplification.

Key Takeaways:

  • The overall prevalence of Eimeria spp. infection in dairy cattle was 34.78% (313/900) in key dairy-producing regions of China.
  • Thirteen Eimeria spp. were identified, with E. bovis and E. zuernii being the predominant species.
  • The study provided updated morphological characterizations for several Eimeria species, including the first report of E. ildefonsoi in China.
  • The researchers performed comparative sequence analysis of the SSU rRNA and COI loci, revealing sequence homology ranges of 93.00%-100.00% (SSU rRNA) and 83.30%-98.80% (COI) among the 13 Eimeria species examined.
  • Phylogenetic analysis based on these two loci effectively differentiated all 13 Eimeria species.
  • The study represents the first report of single-oocyst-derived sequences for Eimeria spp. in dairy cattle at the SSU rRNA and COI loci, establishing a robust method for precise species identification and expanding the genetic database for bovine Eimeria.

Statistics:

  • 900 fecal samples were collected from the rectums of dairy cattle in key dairy-producing regions of China.
  • The overall prevalence of Eimeria spp. infection was 34.78% (313/900).
  • Thirteen Eimeria spp. were identified, with E. bovis (42.81%) and E. zuernii (50.48%) being the most prevalent.
  • The sequence homology ranges for the SSU rRNA and COI loci were 93.00%-100.00% and 83.30%-98.80%, respectively.

Sources:

  • "Morphological and molecular identification of Eimeria spp. (Apicomplexa: Eimeriidae) in dairy cattle, Bos taurus from intensive dairy cattle farms in some areas of China." Veterinary Parasitology, 2025;340:110621.