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<p>Brown dog ticks (<i>Rhipicephalus linnaei</i>) collected from dogs in northeastern Brazil in 2015 tested positive for a rickettsial organism phylogenetically related to <i>Rickettsia tillamookensis</i> (referred to as <i>R. tillamookensis</i>-like). One of the dogs with <i>R. tillamookensis</i>-like-positive ticks tested positive for IgG antibodies to <i>Rickettsia rickettsii</i> antigens, suggesting a potential reaction to spotted fever group rickettsiae. Future research should assess whether the rickettsia detected herein is <i>R. tillamookensis</i> or a closely related species, its distribution, potential vectors, and possible pathogenicity to humans.</p> Graphical Abstract <p></p>

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Rickettsia tillamookensis-like strain in brown dog ticks in Brazil

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月19日

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  • Lucas Lisboa Nunes Bonifácio,
  • Kamila Gaudêncio da Silva Sales,
  • Ennya Rafaella Neves Cardoso,
  • Felipe da Silva Krawczak,
  • Filipe Dantas-Torres

摘要

Brown dog ticks (Rhipicephalus linnaei) collected from dogs in northeastern Brazil in 2015 tested positive for a rickettsial organism phylogenetically related to Rickettsia tillamookensis (referred to as R. tillamookensis-like). One of the dogs with R. tillamookensis-like-positive ticks tested positive for IgG antibodies to Rickettsia rickettsii antigens, suggesting a potential reaction to spotted fever group rickettsiae. Future research should assess whether the rickettsia detected herein is R. tillamookensis or a closely related species, its distribution, potential vectors, and possible pathogenicity to humans.

Graphical Abstract