Dermacentor occidentalis transmits Rickettsia 364D (now classified as Rickettsia rickettsii subsp. californica), the cause of Pacific Coast tick fever. The disease is milder than classical Rocky Mountain spotted fever, but every confirmed case has presented with at least one black necrotic eschar at the bite site - a useful diagnostic clue not seen in RMSF.
Rickettsia parkeri rickettsiosis, transmitted by the Gulf Coast tick, causes fever, headache, and a near-pathognomonic black eschar at the…
Rhipicephalus sanguineus is a competent vector of Rickettsia rickettsii in the southwestern United States and northern Mexico, where…
Dermacentor occidentalis is found only along the Pacific coast of California, Oregon, and Washington and inland through California's coast…
Dermacentor variabilis adults have ornate white-and-brown mottling on the scutum and are roughly the size of a watermelon seed when unfed.…
Ixodes pacificus is the western counterpart of Ixodes scapularis, found from British Columbia south through the Pacific states. It…
Amblyomma cajennense (sensu lato) - now recognized as a complex of six closely related species - is the principal Latin American vector of…