Apodemus agrarius as a new definitive host for Neodiplostomum seoulense

Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea.
The Korean Journal of Parasitology (Impact Factor: 1.15). 07/2007; 45(2):157-61. DOI: 10.3347/kjp.2007.45.2.157
Source: PubMed


A total of 1,496 rodents and insectivores were live-trapped at Yeoncheon-gun (n = 351), Paju-shi (804), and Pocheon-gun (343), Gyeonggi-do (Province), and examined for intestinal helminths, including Neodiplostomum seoulense, seasonally from December 2004 to September 2005. Six species of rodents, including Apodemus agrarius (1,366), Mus musculus (32), Micronytus fortis (28), Eothenomys regulus (9), Micronys minutus (6), and Cricetulus triton (3), and 1 species of insectivores Crocidura lasiura (54) were collected. A total of 321 adult N. seoulense were collected from 19 (1.4%) A. agrarius. The worm burden ranged from 1 to 101 per A. agrarius (mean; 16.9). No N. seoulense was observed in other rodent or insectivore species examined. The infection rate during autumn (4.5%) was higher than those during spring (0.8%), summer (0.8%), and winter (0.5%). The average number of N. seoulense in infected A. agrarius was the highest in spring (66.0 specimens), followed by autumn (15.2), winter (4.5), and summer (3.3). This study first confirms that A. agrarius is a natural definitive host for N. seoulense, and demonstrates that the infection rates and intensities vary seasonally and geographically.

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    • "As the trematodes inhabit in rodents, about 10 species, i.e., E. hortense, E. cinetorchis, Echinostoma revolutum, Echinoparyphium recurvatum, Echinochasmus japonicus, Euparyphium murinum, P. muris, N. seoulense, Clonorchis sinensis, and Metagonimus yokogawai, were reported in Korea [7,8,9,11,12,13,15,16,17,18]. Since E. hortense was reported for the first time in 1938 [7], E. cinetorchis, E. murinum, P. muris, and N. seoulense were added in the list of rodent trematodes by Seo et al. [8,9]. "
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    ABSTRACT: The present study was performed to know the infection status of intestinal helminths in a most common species of field mice, Apodemus agrarius, from 2 southern regions of Korea. Total 133 and 103 mice were collected by the mouse trap in Hapcheon-gun, Gyeongsangnam-do and Gurye-gun, Jeollanam-do, respectively, from July 2005 to June 2006. The small intestine of each mouse was resected and longitudinally opened with a pair of scissors. The intestinal contents were washed with 0.85% saline until the supernatant became clear. Helminths were collected with naked eyes or under a stereomicroscope from the sediment of the intestinal content. More than 11 species of helminths (4 nematode spp., 5 trematode spp., and 2 cestode spp.) were recovered. Among these, heligmosomoid nematodes (97.5%) was the most highly and heavily infected species. As the members of trematodes, Plagiorchis muris, Brachylaima sp., Echinostoma hortense, Echinostoma cinetorchis, and unidentified echinostome larvae were found in the small intestines of 35 (14.8%), 12 (5.1%), 6 (2.5%), 1 (0.4%), and 1 (0.4%) mice respectively. Two species of tapeworms, Hymenolepis nana and Hymenolepis diminuta were also detected in 79 (33.5%) and 21 (8.9%) mice, respectively. Conclusively, heligmosomoid nematodes were the most prevalent (dominant) species among more than 11 helminth species detected, and Brachylaima sp. fluke is newly added in the list of intestinal trematodes in Korea.
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    • "For example, adults of C. armatus were recovered from egrets [22], E. revolutum from rats [23], E. hortense from rats, dogs, and mice [24-27], E. japonicus from egrets, ducks, and shrews [22,27,28], and N. seoulense and P. muris from rats and mice. Before the present study, N. seoulense and P. muris were described only from rodent hosts (Rattus norvegicus and Apodemus agrarius), and they were somewhat smaller than our specimens [24,25,29,30]. "
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    • "In addition, these same rodents and other small mammals serve as hosts for a number of mite, flea, and tick species linked to zoonotic diseases [e.g., scrub typhus, murine typhus, tick-borne encephalitis (TBE), spotted fever group Rickettsia, ehrlichiosis, anaplasmosis, and bartonellosis] and also harbor intestinal parasites that affect people (Hong et al. 1975, Ree et al. 1991, Song et al. 1998, Chae et al. 2003, Chung et al. 2006, Kim et al. 2006, Chai et al. 2007, Kim et al. 2008, Chae et al. 2008). Military training sites in the ROK range in size from small company/battalion sites to large multi-purpose training ranges that support between 100 and 650 personnel per site and host a variety of activities including cantonment and command and control sites; maneuver areas for infantry and wheeled and tracked vehicles; and firing positions and impact zones for small arms fire, artillery, air assault helicopters, and other aircraft. "
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