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Sporadic urban leptospirosis

J M Vinetz1, G E Glass, C E Flexner

  • 1Johns Hopkins School of Medicine, Baltimore, Maryland, USA.

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|November 15, 1996
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Summary
This summary is machine-generated.

Inner-city residents can contract leptospirosis from rat urine exposure in urban alleys. This study identified inner-city rats as carriers of Leptospira interrogans, highlighting a risk for urban populations.

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Area of Science:

  • Infectious Diseases
  • Epidemiology
  • Bacteriology

Background:

  • Leptospira interrogans infections (leptospirosis) are observed in inner-city residents without clear risk factors.
  • The transmission routes for leptospirosis in urban settings remain largely unknown.

Purpose of the Study:

  • To investigate the epidemiology of leptospirosis in inner-city Baltimore, Maryland.
  • To identify the source and transmission pathways of Leptospira interrogans in urban populations.

Main Methods:

  • Epidemiologic investigation of three inner-city leptospirosis patients.
  • Polymerase Chain Reaction (PCR) detection of Leptospira interrogans DNA in patient samples and rat tissues.
  • Serologic testing (microagglutination assay) to confirm L. interrogans infection in patients and rats.
  • Rat trapping and tissue analysis in relevant urban alleyways.

Main Results:

  • Three patients were diagnosed with leptospirosis, likely due to percutaneous exposure to rat urine in Baltimore alleys.
  • Leptospira interrogans DNA was detected in patient specimens (cerebrospinal fluid, serum) and in the kidney/brain tissues of 19 out of 21 trapped rats.
  • Patients exhibited high antibody levels against L. interrogans serogroup icterohaemorrhagiae.

Conclusions:

  • Urban residents exposed to rat urine in inner-city environments are at risk for leptospirosis.
  • Inner-city rat populations frequently harbor Leptospira interrogans, serving as a reservoir for transmission.
  • PCR is a valuable tool for rapid leptospirosis diagnosis and epidemiological studies.
  • Expanding rat populations in deteriorating urban areas may lead to increased recognition of leptospirosis.