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Am. J. Trop. Med. Hyg., 75(2), 2006, pp. 292-294
Copyright © 2006 by The American Society of Tropical Medicine and Hygiene

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SHORT REPORT


DUAL INFECTION OF ANIMAL HOSTS WITH DIFFERENT ECHINOCOCCUS SPECIES IN THE EASTERN QINGHAI-TIBET PLATEAU REGION OF CHINA

NING XIAO, MINORU NAKAO, JIAMIN QIU, CHRISTINE M. BUDKE, PATRICK GIRAUDOUX, PHILIP S. CRAIG, AND AKIRA ITO*
Department of Parasitology, Asahikawa Medical College, Asahikawa, Japan; Institute of Parasitic Diseases, Sichuan Center for Disease Control and Prevention, Chengdu, Sichuan, China; Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas; LBE, Université de Franche-Comté, Besançon Cedex, France; Cestode Zoonoses Research Group, Biomedical Sciences Research Institute and School of Environment and Life Sciences, University of Salford, Greater Manchester, United Kingdom

 

ABSTRACT

The eastern Qinghai-Tibet plateau of China is a highly endemic region of echinococcosis where Echinococcus granulosus sensu stricto (sheep strain), Echinococcus multilocularis, and Echinococcus shiquicus are distributed sympatrically. We developed a polymerase chain reaction-based restriction fragment length polymorphism (PCR-RFLP) method for the identification of the three species in this region. The PCR-RFLP showed the dual infection of animals with different Echinococcus spp. The first case was a domestic dog concurrently infected with adults of E. granulosus and E. multilocularis. The second case was a plateau pika (Ochotona curzoniae) harboring metacestodes of E. multilocularis and E. shiquicus in the liver. The high susceptibility of some mammalian hosts to the parasites and the high prevalence of the three co-endemic species probably increase the chance of mixed infections in the eastern Tibetan plateau.

Received December 19, 2005. Accepted for publication April 1, 2006.

Acknowledgments: We appreciate contributions from Wen Yang, Tiaoying Li, and Xingwang Chen, Institute of Parasitic Diseases, Sichuan Center for Disease Control and Prevention of China; Dalun Liu, Shiqu County Center for Disease Control and Prevention of China; Francis Raoul, Université de Franche-Comté, France; Paul Torgerson, Institute of Parasitology, University of Zürich, Switzerland; and Kenichi Takahashi, Hokkaido Institute of Public Health, Japan.

Financial support: This study was supported by the National Institutes of Health, Ecology of Infectious Diseases Program (1R01 TW01565-01; Principal Investigator, P.S.C.), a Grant-in-Aid from the Japan Society for Promotion of Science to A.I. (14256001, 17256002), and National Nature and Science Fund of China to J.Q. (39070733, 39730400).

* Address correspondence to Akira Ito, Department of Parasitology, Asahikawa Medical College, Midorigaoka Higashi 2-1, Asahikawa 078-8510, Japan. E-mail: akiraito{at}asahikawa-med.ac.jp

Authors’ addresses: Ning Xiao, Minoru Nakao, and Akira Ito, Department of Parasitology, Asahikawa Medical College, Midorigaoka Higashi 2-1-1-1, Asahikawa, 078-8510 Hokkaido, Japan, E-mails: xiaoning{at}asahikawa-med.ac.jp, nakao{at}asahikawa-med.ac.jp, and akiraito{at}asahikawa-med.ac.jp. Jiamin Qiu, Department of Echino-coccosis and Cysticercosis Control, Institute of Parasitic Diseases, Sichuan Center for Disease Control and Prevention, Chengdu 610041, Sichuan Province, China, E-mail: qiujiamin45{at}163.com. Christine M. Budke, Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843-4458, E-mail: Cbudke{at}cvm.tamu.edu. Patrick Giraudoux, LBE, Université de Franche-Comté, 1 place Leclerc, 25030 Besançon cedex, France, E-mail: Patrick.giraudoux{at}univ-fcomte.fr. Philip S. Craig, Cestode Zoonoses Research Group, Biomedical Sciences Research Institute and School of Environment and Life Sciences, University of Salford, Greater Manchester M5 4WT, UK, E-mail: p.s.craig{at}salford.ac.uk.






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