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African tick bite fever.

Yi-Shan Tsai1, Yu-Hung Wu, Pao-Tsuan Kao

  • 1Department of Dermatology, Mackay Memorial Hospital, Taipei, Taiwan.

Journal of the Formosan Medical Association = Taiwan Yi Zhi
|January 26, 2008
PubMed
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African tick bite fever, a rickettsiosis, can manifest with fever and rash after international travel. Prompt diagnosis using serology and DNA sequencing is crucial for effective treatment with antibiotics like minocycline.

Area of Science:

  • Infectious Diseases
  • Dermatology
  • Travel Medicine

Background:

  • International travel increases exposure risk to unfamiliar infectious diseases.
  • Fever with rash is a common presenting sign of various infectious disorders.

Observation:

  • A 62-year-old Taiwanese woman developed eschars, papulovesicular rash, and fever post-travel from South Africa.
  • Biopsy revealed wedge-shaped necrosis, hemorrhage, necrotizing vasculitis, and lymphocytic infiltrate.

Findings:

  • Serological cross-reactivity with Rickettsia conorii and R. rickettsii was noted.
  • DNA sequencing confirmed Rickettsia africae, diagnosing African tick bite fever.
  • The patient showed a positive response to minocycline treatment.

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Implications:

  • Highlights the importance of considering rickettsiosis in febrile patients with rash returning from endemic areas.
  • Emphasizes the utility of advanced diagnostic tools like DNA sequencing for accurate rickettsial identification.
  • Underscores the need for physician awareness regarding travel-associated infectious diseases for timely management.