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. 2024 Jul;30(7):1344–1351. doi: 10.3201/eid3007.231771

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Emerging Infectious Diseases is a publication of the U.S. Government. This publication is in the public domain and is therefore without copyright. All text from this work may be reprinted freely. Use of these materials should be properly cited.

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Maximum-likelihood phylogenetic tree of concatenated multilocus sequences in study of newly recognized spotted fever group Rickettsia as cause of severe Rocky Mountain spotted fever–like illness, northern California, USA. Rickettsia sp. CA23RL1 (bold text) occupies a distinct branch most closely related to R. rickettsii. Rickettsia australis, a transitional group Rickettsia, was included as an outgroup. Bootstrap values for 1,000 replicates are provided at each branch of the phylogenetic tree. GenBank accession numbers are provided in parentheses. Scale bar indicates evolutionary distance as measured by the number of substitutions per site.