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Newly Recognized Spotted Fever Group Rickettsia as Cause of Severe Rocky Mountain Spotted Fever–Like Illness, Northern California, USA
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Newly Recognized Spotted Fever Group Rickettsia as Cause of Severe Rocky Mountain Spotted Fever–Like Illness, Northern California, USA
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Journal Article
Newly Recognized Spotted Fever Group Rickettsia as Cause of Severe Rocky Mountain Spotted Fever–Like Illness, Northern California, USA
2024
Overview
The incidence of spotted fever group (SFG) rickettsioses in the United States has tripled since 2010. Rocky Mountain spotted fever, the most severe SFG rickettsiosis, is caused by Rickettsia rickettsii. The lack of species-specific confirmatory testing obfuscates the relative contribution of R. rickettsii and other SFG Rickettsia to this increase. We report a newly recognized rickettsial pathogen, Rickettsia sp. CA6269, as the cause of severe Rocky Mountain spotted fever-like illness in 2 case-patients residing in northern California. Multilocus sequence typing supported the recognition of this pathogen as a novel Rickettsia genotype most closely related to R. rickettsii. Cross-reactivity observed for an established molecular diagnostic test indicated that Rickettsia sp. CA6269 might be misidentified as R. rickettsii. We developed a Rickettsia sp. CA6269-specific real-time PCR to help resolve this diagnostic challenge and better characterize the spectrum of clinical disease and ecologic epidemiology of this pathogen.
Publisher
U.S. National Center for Infectious Diseases,Centers for Disease Control and Prevention
Subject
/ Adult
/ as Cause of Severe Rocky Mountain Spotted Fever–Like Illness, Northern California, USA
/ bacteria
/ Diseases
/ Female
/ Fever
/ Humans
/ Identification and classification
/ Male
/ Newly Recognized Spotted Fever Group
/ Plasma
/ Rickettsia - isolation & purification
/ Rickettsia rickettsii - genetics
/ Rocky Mountain spotted fever
/ Rocky Mountain Spotted Fever - diagnosis
/ Rocky Mountain Spotted Fever - epidemiology
/ Rocky Mountain Spotted Fever - microbiology
/ spotted fever group Rickettsia
/ Spotted Fever Group Rickettsiosis - diagnosis
/ Spotted Fever Group Rickettsiosis - epidemiology
/ Spotted Fever Group Rickettsiosis - microbiology
/ ticks
/ Typhus
