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Human ehrlichioses in Brazil: first suspect cases.

Simone B Calic1, Márcio A M Galvão, Fátima Bacellar

  • 1Ezequiel Dias Foundation, Belo Horizonte, Brazil. sbcalic@funed.mg.gov.br

The Brazilian Journal of Infectious Diseases : an Official Publication of the Brazilian Society of Infectious Diseases
|October 12, 2004
PubMed
Summary
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Brazilian spotted fever (BSF) rickettsiosis is common in Brazil, but diagnosing other tick-borne diseases like human monocytic ehrlichiosis (HME) is challenging. This study identified suspected HME cases, highlighting the need for broader diagnostic considerations beyond BSF.

Area of Science:

  • Veterinary Medicine
  • Infectious Diseases
  • Public Health

Background:

  • Brazilian spotted fever (BSF) rickettsiosis is the most prevalent human rickettsiosis in Brazil.
  • Routine microbiologic methods pose challenges in diagnosing rickettsial and ehrlichial infections, potentially underestimating their prevalence.
  • Emerging tick-borne diseases, such as human granulocytic anaplasmosis (HGA) and human monocytic ehrlichiosis (HME), present similar symptoms to BSF and are transmitted by ixodid ticks.

Observation:

  • The initial presentation of two suspected human ehrlichiosis cases in Brazil mimicked BSF.
  • Differential diagnosis was performed at the Minas Gerais Rickettsiosis Public Health Laboratory.
  • Clinical and laboratory findings, including positive serology for the HME agent, supported the suspicion of human ehrlichiosis.

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Findings:

  • The study identified the first suspected cases of human ehrlichiosis in Brazil.
  • Serological evidence confirmed the presence of the HME agent.
  • Diagnostic challenges can lead to misidentification of tick-borne illnesses.

Implications:

  • Accurate diagnosis of tick-borne diseases like HME is crucial for effective treatment and public health management in Brazil.
  • Enhanced diagnostic capabilities are needed to differentiate between BSF and other tick-borne rickettsioses.
  • Increased awareness and surveillance for HME and other emerging tick-borne diseases are warranted in Brazil.