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Rickettsia spp. 364D causing a cluster of eschar-associated illness, California

Samantha H Johnston1, Carol A Glaser, Kerry Padgett

  • 1From the *Children's Hospital & Research Center Oakland, Pediatric Infectious Diseases, Oakland; †California Department of Public Health, Center for Infectious Diseases, Richmond, CA; ‡Jiann-Ping Hsu College of Public Health, Georgia Southern University, Statesboro, GA; §Lake County Public Health Department, Lakeport; and ¶Contra Costa Public Health, Martinez, CA.

The Pediatric Infectious Disease Journal
|April 19, 2013
PubMed

Insights

Rickettsia spp. 364D, a tick-borne pathogen, has recently caused mild infections in three children. Diagnosis requires molecular methods due to cross-reactive antibodies from similar rickettsiae.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Pediatrics

Background:

  • Rickettsia spp. 364D, a tick-borne bacterium, was identified in California ticks decades ago.
  • Human cases of Rickettsia spp. 364D infection have only recently been documented.
  • Understanding the clinical presentation and diagnosis of emerging tick-borne diseases is crucial.

Observation:

  • This report details the clinical course of the first three pediatric cases of Rickettsia spp. 364D infection.
  • Clinical features observed were generally mild.
  • Common symptoms included eschar, fever, headache, malaise, and lymphadenopathy.

Findings:

  • The study documents the initial pediatric cases of Rickettsia spp. 364D.
  • Clinical manifestations were consistent with mild rickettsial infections.
  • Antigenic similarities among Rickettsia species can cause cross-reactive antibody responses, complicating serological diagnosis.

Implications:

  • Definitive diagnosis of Rickettsia spp. 364D infections necessitates the use of molecular methods.
  • Increased awareness and diagnostic capabilities for this pathogen are important for public health.
  • Further research into the epidemiology and clinical spectrum of Rickettsia spp. 364D is warranted.

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