Acta Parasitologica

, Volume 64, Issue 2, pp 418–422 | Cite as

Susceptibility to Various Coccidiostats in the Murine Coccidian Parasite Eimeria krijgsmanni

  • Kota Inoue
  • Masashi Tsujio
  • Makoto Matsubayashi
  • Ryota Inoue
  • Hitoshi Hatai
  • Masako Andoh
  • Keisuke Abe
  • Toshihiro Matsui
  • Tomohide MatsuoEmail author
Short Communication



Murine Eimeria spp. have been used as effective experimental models of disease instead of large mammalian hosts such as cattle. We here examine drug susceptibility of the uncharacterized murine intestinal protozoan parasite, Eimeria krijgsmanni.

Materials and methods

The effectiveness of different treatments against infection of E. krijgsmanni was examined for suppression of oocyst shedding: ST mixture ST mixture, pyrimethamine, Ektecin and toltrazuril.


ST mixture and pyrimethamine did not suppress oocyst shedding effectively. Although therapeutic efficacy of Ektecin was demonstrated, the dose required was larger than that for cattle and chickens. Oocyst shedding was only completely suppressed completely by continuous administration of toltrazuril. Furthermore, it was confirmed through morphological examination that early developmental stage zoites appeared in host epithelial cells during and following treatment by toltrazuril, and toltrazuril could not eliminate residual zoites in epithelial cells.


E. krijgsmanni may be relatively resistant to these anti-coccidian agents and might therefore have different characteristics that differ from other coccidia with regard to drug susceptibility.


Coccidium Mouse Sulfa drug Toltrazuril Pyrimethamine Eimeria 



This work was partly supported by Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (Nos. 16K08025 and 16H05803).


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Copyright information

© Witold Stefański Institute of Parasitology, Polish Academy of Sciences 2019

Authors and Affiliations

  • Kota Inoue
    • 1
  • Masashi Tsujio
    • 2
  • Makoto Matsubayashi
    • 3
  • Ryota Inoue
    • 1
  • Hitoshi Hatai
    • 4
  • Masako Andoh
    • 5
  • Keisuke Abe
    • 1
  • Toshihiro Matsui
    • 6
  • Tomohide Matsuo
    • 1
    Email author
  1. 1.Laboratory of Parasitology, Joint Faculty of Veterinary MedicineKagoshima UniversityKagoshimaJapan
  2. 2.Laboratory of Anatomy, Joint Faculty of Veterinary MedicineKagoshima UniversityKagoshimaJapan
  3. 3.Laboratory of International Prevention of Epidemics, Department of Veterinary Science, Graduate School of Life and Environmental ScienceOsaka Prefecture UniversityIzumisanoJapan
  4. 4.Laboratory of Veterinary Histopathology, Joint Faculty of Veterinary MedicineKagoshima UniversityKagoshimaJapan
  5. 5.Laboratory of Public Health, Joint Faculty of Veterinary MedicineKagoshima UniversityKagoshimaJapan
  6. 6.Seisen UniversityTokyoJapan

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