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Ehrlichia infection in Italy

M Nuti1, D A Serafini, D Bassetti

  • 11st Rome University, Italy.

Emerging Infectious Diseases
|December 29, 1998
PubMed
Summary
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Tick bites in Sardinia led to Ehrlichia chaffeensis seroconversion in U.S. citizens. Ehrlichiosis was suspected in local residents but unconfirmed. Alpine populations showed antibodies to Ehrlichia phagocytophila.

Area of Science:

  • Medical Entomology
  • Infectious Diseases
  • Public Health

Background:

  • Ehrlichiosis is a tick-borne illness caused by Ehrlichia species.
  • Previous studies have documented Ehrlichia infections in various regions, but data from Sardinia and Alpine areas require further investigation.
  • Understanding the prevalence and seroconversion rates is crucial for public health surveillance.

Purpose of the Study:

  • To investigate the incidence of Ehrlichia chaffeensis seroconversion in U.S. citizens exposed to ticks in Sardinia.
  • To assess the prevalence of Ehrlichia phagocytophila antibodies in high-risk groups and controls in Alpine regions.
  • To evaluate the laboratory confirmation of suspected ehrlichiosis cases in local residents.

Main Methods:

  • Serological testing for Immunoglobulin M (IgM) antibodies against Ehrlichia chaffeensis in U.S. citizens.

Related Experiment Videos

  • Laboratory confirmation of suspected ehrlichiosis cases in local Sardinian residents.
  • Antibody detection for Ehrlichia phagocytophila in foresters, hunters, and control groups in Alpine areas.
  • Follow-up serological testing of individuals bitten by ticks.

    • Main Results:

    • Immunoglobulin M seroconversion to Ehrlichia chaffeensis was confirmed in U.S. citizens exposed to ticks in Sardinia.
    • Seven suspected cases of ehrlichiosis in local Sardinian residents were not laboratory-confirmed.
    • Antibodies to Ehrlichia phagocytophila were detected in 8.6% of foresters, 5.5% of hunters, and 1.5% of controls in Alpine areas.
    • Only one out of 153 individuals bitten by ticks showed Ehrlichia antibodies after six months.

    Conclusions:

    • Tick exposure in Sardinia can lead to Ehrlichia chaffeensis infection in U.S. citizens.
    • Ehrlichiosis diagnosis in local populations requires rigorous laboratory confirmation.
    • Ehrlichia phagocytophila antibodies are present in individuals occupationally exposed in Alpine regions, indicating enzootic circulation.