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Volume 31, Number 2—February 2025
Research Letter

Ixodes scapularis Tick Parasitizing Dog in Dawson County, Montana, USA, 2023

Philip E. StewartComments to Author , Justin B. Lack, Marni Rolston, Kimmo Virtaneva, Paul A. Beare, Craig M. Martens, Marshall E. Bloom, and Tom G. Schwan
Author affiliation: National Institutes of Health Rocky Mountain Laboratories, Hamilton, Montana, USA (P.E. Stewart, K. Virtaneva, P.A. Beare, C.M. Martens, M.E. Bloom, T.G. Schwan); National Institutes of Health, Rockville, Maryland, USA (J.B. Lack); Montana State University, Bozeman, Montana, USA (M. Rolston)

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Figure 2

Phylogenetic analysis of Ixodes scapularis tick parasitizing dog in Dawson County, Montana, USA, 2023. Phylogram of cytochrome oxidase C subunit I (coxI) sequences showing near identity of the Dawson County tick with I. scapularis. We used RAxML (https://github.com/amkozlov/raxml-ng) to generate an unrooted maximum-likelihood phylogeny of 583-bp coxI sequences with 500 bootstrap replicates. Genbank accession numbers for each sequence precede the species name. Branch labels indicate the percentage of bootstrap replicates supporting a given branch. Percentages of uncorrected pairwise identity to the Dawson County, Montana, specimen are indicated in parentheses. With the exceptions of I. cookei and I. pacificus, the other Ixodes spp. ticks in this tree are indigenous to Montana. Scale bar indicates nucleotide substitutions per site.

Figure 2. Phylogenetic analysis of Ixodes scapularis tick parasitizing dog in Dawson County, Montana, USA, 2023. Phylogram of cytochrome oxidase C subunit I (coxI) sequences showing near identity of the Dawson County tick with I. scapularis. We used RAxML (https://github.com/amkozlov/raxml-ng) to generate an unrooted maximum-likelihood phylogeny of 583-bp coxI sequences with 500 bootstrap replicates. Genbank accession numbers for each sequence precede the species name. Branch labels indicate the percentage of bootstrap replicates supporting a given branch. Percentages of uncorrected pairwise identity to the Dawson County, Montana, specimen are indicated in parentheses. With the exceptions of I. cookei and I. pacificus, the other Ixodes spp. ticks in this tree are indigenous to Montana. Scale bar indicates nucleotide substitutions per site.

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