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Harasawa R.,The Iwate Research Center for Wildlife Diseases | Fujita H.,Mahara Institute of Medical Acarology | Kadosaka T.,Aichi Medical University | Ando S.,Japan National Institute of Infectious Diseases | Rikihisa Y.,Ohio State University
International Journal of Systematic and Evolutionary Microbiology | Year: 2015

Mycoplasma haemomuris is causative of infectious anaemia or splenomegaly in rodents. We examined the nucleotide sequences of the non-ribosomal genes, rnpB and dnaK, in strains of the species M. haemomuris detected in small field mice and black rats. rnpB nucleotide sequences in strains of the species M. haemomuris isolated from small field mice and black rats had only 89% sequence similarity, suggesting their separation into two distinct subgroups. dnaK had a nucleotide sequence similarity of 84% between the subgroups. These results support the classification of M. haemomuris into two genetically distinct subgroups. Here we propose the establishment of these subgroups as ‘Candidatus Mycoplasma haemomuris subsp. musculi’, detected in small field mice (Apodemus argenteus), and ‘Candidatus Mycoplasma haemomuris subsp. ratti’, detected in black rats (Rattus rattus). ©2015 IUMS.

Soon Kim K.,Nihon University | Inoue K.,Nihon University | Kabeya H.,Nihon University | Sato S.,Nihon University | And 9 more authors.
Journal of Wildlife Diseases | Year: 2016

We collected 641 small mammals belonging to 17 species of Rodentia and four species of Soricomorpha in Japan, Korea, Russia, Taiwan, and Thailand and investigated the prevalence and genetic diversity of Bartonella species. Apodemus (field mice) and Rattus (rats) were the most-common genera captured, making up 56.0% and 23.1% of the total specimens, respectively. Bartonellae were isolated from 54.6% of the collected animals, and the prevalence varied depending on the host species and the country of origin. The isolates were identified to the species level based on gltA and rpoB sequences. Although most Bartonella species were shared by more than two host species, the distribution patterns of Bartonella species clearly differed among the four most-common host genera: Apodemus, Rattus, Myodes (voles), and Suncus (shrews). The predominant Bartonella species were Bartonella grahamii in Apodemus, Bartonella tribocorum in Rattus, B. grahamii and Bartonella taylorii in Myodes, and an unclassified Bartonella sp. in Suncus. © Wildlife Disease Association 2016.

Oda S.,Nihon University | Kabeya H.,Nihon University | Sato S.,Nihon University | Shimonagane A.,Nihon University | And 6 more authors.
Journal of Wildlife Diseases | Year: 2015

Yersinia enterocolitica was isolated from 15.7% (88/560) of wild rodents captured in 15 prefectures in Japan. Prevalences by rodent species were 18.0%(70/388) in Japanese field mice (Apodemus speciosus), 20% (14/71) in small Japanese field mice (Apodemus argenteus), and 11% (4/38) in gray red-backed vole (Myodes rufocanus bedfordiae), suggesting that these rodent species are important reservoirs of Y. enterocolitica. Although most of the isolates were identified as biotype 1A, the pathogenic bioserotype 1B/O:8 was detected in one of the A. speciosus and in three of the A. argenteus captured in Aomori Prefecture. It is suggested that Apodemus mice may be an important reservoir of Y. enterocolitica, and that there are foci of the pathogenic bioserotype 1B/O:8 in Aomori Prefecture, because human sporadic cases by the serotype have been reported in this prefecture. ©.Wildlife Disease Association 2015

Uni S.,University of Malaya | Uni S.,Osaka City University | Bain O.,CNRS Systematics, Biodiversity and Evolution Institute | Fujita H.,Mahara Institute of Medical Acarology | And 4 more authors.
Parasite | Year: 2013

Hard ticks taken from the JPNese serow, Capricornis crispus, in Yamagata Prefecture, Honshu, harboured infective larvae of onchocercid filariae after incubation from the 22nd to the 158th day. Haemaphysalis flava and H. japonica contained one to eight filarial larvae; females, males and a nymph of the ticks were infected. The 44 infective larvae recovered were 612-1,370 μm long, and 11 of them, 930-1,340 μm long, were studied in detail. The larvae possessed the morphologic characteristics of the larvae of the genus Cercopithifilaria, namely an oesophagus with a posterior glandular part, no buccal capsule and a long tail with three terminal lappets. Five types (A to E) of infective larvae were identified based on the morphologic characteristics. While to date five species of Cercopithifilaria have been described from the JPNese serow, a specific identification of the larvae found in this study was generally not possible. Only type E larvae could be tentatively assigned to Cercopithifilaria tumidicervicata, as they had a cervical swelling similar to that of the adults of this species. A key for the identification of the five larval types is presented. The study presents circumstantial evidences indicating that H. flava and H. japonica may transmit Cercopithifilaria spp. to JPNese serows. It also suggests the possibility that such filarial larvae will be found in hard ticks anywhere, because Cercopithifilaria is distributed worldwide, though this genus generally goes unnoticed, as its microfilariae occur in the skin, not in the blood, of host animals. © 2013 S. Uni et al., published by EDP Sciences.

Takajo I.,University of MiyazakiMiyazaki | Sekizuka T.,Japan National Institute of Infectious Diseases | Fujita H.,Mahara Institute of Medical Acarology | Kawano A.,University of MiyazakiMiyazaki | And 10 more authors.
Emerging Infectious Diseases | Year: 2016

A 60-year-old woman experienced fever, headache, rash, and altered vision after returning to Japan from India. Testing detected elevated antibody titers to spotted fever group rickettsia; PCR on blood yielded positive results for the rickettsial outer membrane protein A gene. We isolated a unique rickettsial agent and performed a full-genome analysis. © 2016, Centers for Disease Control and Prevention (CDC). All rights reserved.

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