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Related Experiment Videos

Vaccine development against Theileria parasite

M Onuma1, S Kubota, T Kakuda

  • 1Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan.

The Southeast Asian Journal of Tropical Medicine and Public Health
|January 1, 1997
PubMed
Summary

Bovine piroplasmosis, caused by Theileria sergenti, leads to significant economic losses in Japan. Research identified mixed parasite populations and developed allele-specific PCR and vaccine candidates targeting the p32 protein, showing promise for disease control.

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Area of Science:

  • Veterinary Parasitology
  • Molecular Diagnostics
  • Vaccine Development

Background:

  • Bovine piroplasmosis, caused by Theileria sergenti, is a significant economic burden on Japanese cattle farming.
  • Parasite populations are genetically and antigenically diverse, complicating control strategies.

Purpose of the Study:

  • To develop methods for differentiating Theileria sergenti parasite populations.
  • To create and evaluate vaccine candidates targeting the immunodominant p32 surface protein.

Main Methods:

  • Design of allele-specific oligonucleotide primers for polymerase chain reaction (PCR) to differentiate p32 alleles (C and I types).
  • Production of vaccine candidates: recombinant baculovirus p32 and synthetic peptide containing the Lys-Glu-Lys (KEK) motif.
  • Experimental immunization of calves with vaccine candidates and adjuvant, followed by assessment of parasitemia and clinical signs.

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Main Results:

  • Allele-specific PCR confirmed that most infected calves harbor mixed C and I type T. sergenti populations.
  • Immunization with recombinant p32 or KEK-containing peptide reduced parasitemia and clinical symptoms.
  • Parasites expressing the immunogen's p32 allele showed suppressed growth, indicating allele-specific efficacy.

Conclusions:

  • A cocktail vaccine incorporating KEK peptides from both C and I type parasites is recommended for effective control of Theileria parasite infections in Japan.
  • Allele-specific PCR is a valuable tool for characterizing parasite populations.