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Volume 32, Number 1—January 2026

Dispatch

Dermacentor occidentalis Ticks and Link to Rickettsia lanei Infections, California, USA

Will S. ProbertComments to Author , Chantha Kath, Naomi Putirka, Megan E.M. Saunders, Brenda Bermudez, Matthew I. Cazas, Alex Espinosa, Hannah Romo, and Jill K. Hacker
Author affiliation: Author affiliations: California Department of Public Health, Richmond, California, USA (W.S. Probert, C. Kath, M.E.M Saunders, B. Bermudez, M.I. Cazas, A. Espinosa, H. Romo, J.K. Hacker); San Francisco State University, San Francisco, California, USA (N. Putirka)

Main Article

Table 1

PCR detection of Rickettsia in Dermacentor and Haemaphysalis ticks collected in California, 2024

Tick species No. ticks tested No. PCR-positive ticks (%)
Rickettsia genus R. rickettsii subspecies rickettsii R. rickettsii subsp. californica R. lanei
Dermacentor occidentalis 2,872 402 (14) 0 38 (1.32) 1 (0.03)
Dermacentor similis 69 14 (20.29) 0 0 0
Haemaphysalis leporispalustris 666 23 (3.45) 0 0 2 (0.3)

Main Article

Page created: December 13, 2025
Page updated: January 29, 2026
Page reviewed: January 29, 2026
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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