Survey on Wild Rodents for Endoparasites in Iwate Prefecture, Japan

Ito, Megumi; Itagaki, Tadashi

doi:10.1292/jvms.65.1151

Cited by 27 publications

(28 citation statements)

References 8 publications

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“…Echinostoma macrorchis is one of the species and was described originally from naturally infected rats, Rattus rattus and Rattus norvegicus , in Japan [3]. Infections with this echinostome have been found in other rodent species and also birds in Japan [4-6]. Natural human infections were reported in Japan [7,8].…”

Section: Introductionmentioning

confidence: 99%

Echinostoma macrorchis in Lao PDR: Metacercariae in Cipangopaludina Snails and Adults from Experimentally Infected Animals

Sohn

Chai

et al. 2013

Korean J Parasitol

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The echinostome metacercariae encysted in Cipangopaludina sp. snails that were purchased from a market in Vientiane Municipality, Lao PDR, were identified as Echinostoma macrorchis (Digenea: Echinostomatidae) through recovery of adult flukes after experimental infection to rats and a cat. The metacercariae were round, 113-128 (121)×113-125 (120) µm, having a thick cyst wall, a head collar armed with collar spines, and excretory granules. The adult flukes recovered from the rats and cat at day 14 and 30 post-infection, respectively, were elongated, ventrally curved, and 3.9-6.3×0.7-1.1 mm in size. The head collar was distinct, bearing 43-45 collar spines with 5 angle spines on each side. Two testes were large (as the name implies), tandem, and slightly constricted at the middle, with irregular margins. Eggs were operculated, ovoid to elliptical, and 88-95×56-60 µm. In scanning electron microscopy, the head collar was prominent, with 43-45 collar spines. Scale-like tegumental spines were densely distributed on the ventral surface between the oral and ventral suckers. Sensory papillae were distributed mainly on the tegument around the 2 suckers. It is confirmed that E. macrorchis is distributed in Lao PDR using Cipangopaludina sp. snails as the second intermediate host.

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Section: Introductionmentioning

confidence: 99%

Echinostoma macrorchis in Lao PDR: Metacercariae in Cipangopaludina Snails and Adults from Experimentally Infected Animals

Sohn

Chai

et al. 2013

Korean J Parasitol

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“…Although Giardia was found in humans, dogs, wild rodents, and some psittaci in Japan [1,8,9,14,22], there are no reports about Giardia infection in cattle in Japan. In addition, molecular analysis has been performed only for the isolates from dogs in Japan [1], and therefore the molecular epidemiology of Giardia infection in Japan has been unclear.…”

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confidence: 99%

Identification of Genotypes of Giardia intestinalis Isolates from a Human and Calf in Japan

2005

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ABSTRACT. Giardia intestinalis is recognized as a significant pathogen in humans and animals, causing diarrhea. Recent molecular studies indicate that G. intestinalis is composed of genetically distinct multiple genotypes. Therefore, it is valuable to distinguish among genotypes in the epidemiology of Giardia infection in humans and animals. Although G. intestinalis has been found in humans and animals in Japan, the genotype of isolates remains unclear except for several isolates from dogs, because identification has been performed only by conventional microscopy. We report herein the genotypes of G. intestinalis isolates distinguished by a phylogenetic analysis. G. intestinalis isolates originated from a patient and a calf were found to have Assemblage B and E, respectively.

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“…Out of them, R. orbitalis was noticed relatively frequently. Its third-stage parasitic larvae were detected within eye orbits and lachrymal sacs of various rodents in Holarctic when moving intensively in the eye orbit, or during overall surveys of helminth fauna of small ground mammals (Yagi et al, 1983;Sudhaus & Asakawa, 1991;Tenora & Baruš, 1991;Casanova et al, 1996;Yensen et al, 1996;Ito & Itagaki, 2003). Several other papers were focused directly on the research of R. orbitalis occurrence (Cross & Santana, 1974;Prokopič et al, 1974;Baruš & Hrabě, 1991;Schulte & Poinar, 1991;Sainsbury et al, 1996).…”

Section: Chionomys Nivalis Clethrionomys Glareolus Microtus Tatricusmentioning

confidence: 99%

“…A microbotrophic nematode Rhabditis orbitalis Sudhaus et Schulte, 1986 lives in nests of wide range of small rodents of the families Arvicollidae, Muridae and Gliridae in Holarcic (Casanova et al, 1996;Sainsbury et al, 1996;Yensen et al, 1996;Ito & Itagaki, 2003). It was learned experimentally (Schulte, 1989), that its two-stage larvae can develop in three ways (larval "triphenism").…”

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confidence: 99%

Long-term variation in an occurrence of Rhabditis orbitalis parasitic larvae (Nematoda, Rhabditidae) in the eyes of montane rodents

2006

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232 SummaryDuring a long-term survey (1999 -2005) of parasitic larvae of nidicolous nematode Rhabditis orbitalis Sudhaus et Schulte, 1986 in the West Tatra Mts, the nematodes were detected in the eye orbits of snow voles Chionomys nivalis in 1999, 2004 and 2005. In the last year, R. orbitalis was detected also in another vole species Clethrionomys glareolus and Microtus tatricus both in previously studied site and in the Low Tatra Mts, however, it has never appeared at other rodent species. For the first time, an irregular occurrence of the R. orbitalis parasitic larvae has been ascertained in natural conditions of the Slovak mountains. The eye nematodes occurred only during autumn or cold and rather wet summer months, when density of the preferred host Ch. nivalis was relatively low. A hypothesis has been put forward that an occasional appearance of parasitic eye larvae in the life cycle of bacteriophagous R. orbitalis represents a strategy for surviving periods of a scarcity of bacterial food, which could be influenced by a combination of weather conditions, density of host rodents and seasonal abundance of R. orbitalis in rodent nests.

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Survey on Wild Rodents for Endoparasites in Iwate Prefecture, Japan

Cited by 27 publications

References 8 publications

Echinostoma macrorchis in Lao PDR: Metacercariae in Cipangopaludina Snails and Adults from Experimentally Infected Animals

Echinostoma macrorchis in Lao PDR: Metacercariae in Cipangopaludina Snails and Adults from Experimentally Infected Animals

Identification of Genotypes of Giardia intestinalis Isolates from a Human and Calf in Japan

Long-term variation in an occurrence of Rhabditis orbitalis parasitic larvae (Nematoda, Rhabditidae) in the eyes of montane rodents

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