Abstract
The 16S rRNA gene of a new infectious agent, strain AS145T (T = type strain), which was isolated from a wild mouse in Japan, was amplified by using the PCR. The amplimers were directly sequenced by dideoxynucleotide methods with Taq DNA polymerase. Sequence comparisons with other members of the tribe Ehrlichieae and related species revealed that the infectious agent isolated from the mouse is a new species of the genus Ehrlichia that is most closely related to Ehrlichia chaffeensis (level of sequence similarity, 97.9%), an agent of human ehrlichiosis in the United States. This result was consistent with the results of an immunoblot analysis performed with immune sera against different ehrlichiosis agents. On the basis of these findings and other morphological, biological, and serological characteristics of the organism, we propose that ehrlichiae with these properties belong to a new species, Ehrlichia muris.
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