Newly Recognized Spotted Fever Group Rickettsia as Cause of Severe Rocky Mountain Spotted Fever–Like Illness, Northern California, USA
Will S. Probert
, Monica P. Haw, Aran C. Nichol, Carol A. Glaser, Sarah Y. Park, Laura E. Campbell, Kavita K. Trivedi, Hannah Romo, Megan E.M. Saunders, Anne M. Kjemtrup, Kerry A. Padgett, and Jill K. Hacker
Author affiliations: California Department of Public Health, Richmond, California, USA (W.S. Probert, M.P. Haw, C.A. Glaser, H. Romo, M.E.M Saunders, K.A. Padgett, J.K. Hacker); Kaiser Permanente, Oakland, California, USA (A.C. Nichol); Karius, Redwood City, California, USA (S.Y. Park); Alameda County Public Health Department, San Leandro, California, USA (L.E. Campbell, K.K. Trivedi); California Department of Public Health, Sacramento, California, USA (A.M. Kjemtrup)
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Figure
Figure. 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.
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