Korean J Parasitol.  2013 Dec;51(6):683-687. 10.3347/kjp.2013.51.6.683.

Paragonimus paishuihoensis Metacercariae in Freshwater Crabs, Potamon lipkei, in Vientiane Province, Lao PDR

  • 1Department of Microbiology and Immunology, School of Medicine, Fukuoka University, Fukuoka, Japan.
  • 2Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, Hanoi, Vietnam.
  • 3Sigma Clinic, Fukuoka, Japan.
  • 4Institut de la Francophonie pour la Medecine Tropicale, Vientiane, Lao PDR.
  • 5Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, Switzerland.
  • 6Faculties of Medicine and Pharmacy, Limoges, France.
  • 7Laboratory of Veterinary Parasitic Diseases, Faculty of Agriculture, University of Miyazaki, Miyazaki, Japan. horii@cc.miyazaki-u.ac.jp
  • 8Research Affairs, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand.


Among Paragonimus species, P. paishuihoensis is one of the most mysterious and poorly understood species. Metacercariae are characterized by having a unique dendritically branched excretory bladder. However, the morphology of the adult worm remains unknown. To date, metacercariae of this species have been reported only in China and Thailand. In this study, we first found P. paishuihoensis metacercariae in freshwater crabs, Potamon lipkei, in Hinheub District, Vientiane, Lao PDR, with a prevalence of 77.7% and the average intensity of 10.3 (range 1-28) metacercariae per crab. The molecular data based on ITS2 and CO1 markers indicated that P. paishuihoensis from Laos and Thailand were almost completely identical and were close to members of the Paragonimus bangkokensis/Paragonimus harinasutai complex. Attempts to infect experimental animals (cats, dogs, and rats) with P. paishuihoensis were unsuccessful, suggesting that these animals might be unsuitable definitive hosts for the species. Further studies are necessary to elucidate the taxonomic status and life cycle of P. paishuihoensis.


Paragonimus paishuihoensis; metacercaria; freshwater crab; Potamon lipkei; Lao PDR
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