Takahashi, Mamoru


Publications
2

Discovery of a novel spotted fever group Rickettsia, “Candidatus Rickettsia kedanie,” in unfed larval chigger mites, Leptotrombidium scutellare

Citation
Ogawa et al. (2024). Microbiology and Immunology
Names
Ca. Rickettsia kedanie
Abstract
AbstractSpotted fever group (SFG) rickettsia, the causative agent of SFG rickettsiosis, is predominantly carried by ticks, whereas Orientia tsutusgamushi, the causative agent of scrub typhus, is primarily transmitted by chigger mites in Japan. In this study, we attempted to isolate intracellular eubacteria from Leptotrombidium scutellare, a major vector of O. tsutsugamushi; moreover, we isolated an SFG rickettsia using a mosquito‐derived cell line. Draft genome sequences of this unique isolate,

Ultrastructure and phylogenetic analysis of ‘Candidatus Neoehrlichia mikurensis' in the family Anaplasmataceae, isolated from wild rats and found in Ixodes ovatus ticks

Citation
Kawahara et al. (2004). International Journal of Systematic and Evolutionary Microbiology 54 (5)
Names
Ca. Neoehrlichia mikurensis
Abstract
A novel bacterium that infects laboratory rats was isolated from wild Rattus norvegicus rats in Japan. Transmission electron microscopy of the spleen tissue revealed small cocci surrounded by an inner membrane and a thin, rippled outer membrane in a membrane-bound inclusion within the cytoplasm of endothelial cells. Phylogenetic analysis of the 16S rRNA gene sequence of the bacterium found in R. norvegicus rats and Ixodes ovatus ticks in Japan revealed that the organism represents a novel clade