Korean J Parasitol.  2019 Dec;57(6):647-656. 10.3347/kjp.2019.57.6.647.

Infections of Two Isthmiophora Species (Digenea: Echinostomatidae) in Wild Mammals from Republic of Korea with Their Morphological Descriptions

Affiliations
  • 1Department of Parasitology, Parasite Research Center and Parasite Resource Bank, School of Medicine, Chungbuk National University, Cheongju 28644, Korea. kseom@chungbuk.ac.kr
  • 2The Wildlife Center of Chungbuk, Cheongju 28116, Korea.
  • 3College of Veterinary Medicine, Chungbuk National University, Cheongju 28644, Korea.
  • 4National Institute of Ecology, Seocheon 33657, Korea.
  • 5Korea National Park Institute for Biodiversity Conservation, Gurye 57616, Korea.

Abstract

Isthmiophora hortensis (Digenea: Echinostomatidae) is a dominant echinostome in animal reservoir hosts and humans in the Republic of Korea (Korea). We intended to investigate the infection status with this echinostome species in the several species of wild animals and describe the morphological characteristics in the faunistic view point. A total of 175 animal carcasses belonging to 3 families, i.e., Canidae, Felidae and Mustelidae, were collected from the southern regions of Korea from March 2010 to July 2017. Isthmiophora spp. worms were recovered from the small intestines of each animal under a stereomicroscope after washing of intestinal contents. Isthmiophora hortensis was recovered from 4 species of wild carnivores, i.e., Nyctereutes procyonoides (3/107: 2.8%), Mustela sibirica (11/31: 35.5%), Meles lucurus (2/3: 33.3%) and Martes flavigula (1/2: 50%). The other 3 carnivores comprising stray dogs, cat and leopard cat were negative for I. hortensis infection (0/2, 0/10 and 0/12, respectively). Specimens obtained from the Lutra lutra (6/8: 75%) were identified as a distinct species, I. inermis, by morphological comparison. Isthmiophora inermis has thinner body, elongate testes and different anterior limits of vitelline fields. Detailed morphological descriptions and comparisons with the morphological characteristics are provided. Conclusively, it was confirmed for the first time that 3 species of mustelid mammals, i.e., M. sibirica, M. lucurus, and M. flavigula, are to be the new definitive hosts of I. hortensis in Korea. Additionally, I. inermis is to be newly added in the Korean echinostome fauna.

Keyword

Isthmiophora hortensis; Isthmiophora inermis; mustelidae; wild carnivore

MeSH Terms

Animals
Animals, Wild
Canidae
Cats
Dogs
Felidae
Gastrointestinal Contents
Humans
Intestine, Small
Korea
Mammals*
Mustelidae
Otters
Panthera
Raccoon Dogs
Republic of Korea*
Testis
Vitellins
Vitellins
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