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In metropolitan Tokyo, theEhrlichia muris seropositivity rate of 24 wild mice was 63% in Hinohara Village, but in the surrounding areas, it was 0 to 5%. This finding suggests that the reservoir ofE. muris is focal. Among the 15 seropositive mice, ehrlichiae were isolated from 9Apodemus speciosus mice and 1A. argenteus mouse, respectively. Five ehrlichial isolates were obtained from 10 ticks (Haemaphysalis flava ) collected in Asuke Town, Aichi Prefecture, where theE. muris type strain had been isolated. These new isolates were compared with theE. muris type strain. The mouse virulence and ultrastructure of the new isolates were similar to those of the type strain, and all of them were cross-reactive with each other, as well as with the type strain, by indirect immunofluorescent-antibody test. The levels of similarity of the base sequences of the 16S rRNA gene of one of theA. speciosus isolates and one of the tick isolates to that of theE. muris type strain were 99.79 and 99.93%, respectively. We suggest that all of these isolates areE. muris ; thatE. muris is not limited toEothenomys kageus but infects other species of mice; and thatE. muris is present at locations other than Aichi Prefecture. It appears thatH. flava is a potential vector ofE. muris . Twenty (1%) of 1803 humans from metropolitan Tokyo were found to be seropositive forE. muris antibodies. A serological survey revealed that exposure toE. muris or organisms antigenically cross-reactive toE. muris occurred among dogs, wild mice, monkeys, bears, deer, and wild boars in Gifu Prefecture, nearby prefectures, and Nagoya City, central Japan. However, human beings andRattus norvegicus rats in this area were seronegative. These results indicate broader geographic distribution of and human and animal species exposure toE. muris or relatedEhrlichia spp. in Japan.

journal of clinical microbiology

Comparison of <i>Ehrlichia muris</i> Strains Isolated from Wild Mice and Ticks and Serologic Survey of Humans and Animals with <i>E. muris</i> as Antigen

Comparison of Ehrlichia muris Strains Isolated from Wild Mice and Ticks and Serologic Survey of Humans and Animals with E. muris as Antigen