Pacific Coast tick fever: Rickettsia philipii

12 October 2016

Pacific Coast tick fever (PCTF): Rickettsia philipii (type strain “Rickettsia 364D”)

Rickettsia philipii, the etiologic agent of Pacific Coast tick fever (PCTF).

Transmitted to people by the Pacific Coast tick, Dermacentor occidentalis.

As of 2016, fourteen cases (14) cases reported (all in California); 1st case in 2008. Most cases in Northern CA

The Pacific Coast tick’s range includes most of California, southern Oregon, and northern Baja California, Mexico

Symptoms: Fever, headache, eschar(s) [Eschar is dead tissue that falls off (sheds) from healthy skin.]

Multiple infections may be transmitted from the bite of the same tick.
Pacific Coast Tick3

Click here for journal article on Pacific Coast Tick Fever

Left: Pacific Coast Tick - Female, Male and Nymph (Photo: Ervic Aquino, CA Dept. Public Health)

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