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Nocardia species infections in a large county hospital in Miami: 6 years experience

José G Castro1, Luis Espinoza

  • 1University of Miami, Miller School of Medicine, Department of Medicine, Division of Infectious Diseases, Miami, FL 33136, USA. jcastro2@med.miami.edu <jcastro2@med.miami.edu>

The Journal of Infection
|September 19, 2006
PubMed

Insights

Nocardiosis is a serious infection, particularly in individuals with advanced HIV. This study found that most nocardiosis cases in South Florida occurred in HIV patients with very low CD4 counts, often affecting the lungs.

Area of Science:

  • Infectious Diseases
  • Immunocompromised Hosts
  • Pulmonary Medicine

Background:

  • Nocardiosis is an opportunistic infection caused by aerobic actinomycetes.
  • It primarily affects immunocompromised individuals, including those with HIV/AIDS.
  • Understanding the epidemiology in specific regions is crucial for clinical management.

Purpose of the Study:

  • To review the incidence and characteristics of nocardiosis cases over a 6-year period.
  • To determine the prevalence of co-infection with HIV among nocardiosis patients.
  • To identify clinical features and common sites of infection in this population.

Main Methods:

  • Retrospective review of all diagnosed nocardiosis cases.
  • Data collection included patient demographics, co-morbidities (especially HIV status), and CD4 counts.
  • Analysis of clinical presentation and localization of infection.

Main Results:

  • Twenty-five cases of nocardiosis were identified over 6 years.
  • A significant proportion (76%) of patients had concurrent HIV infection.
  • HIV-infected patients typically presented with CD4 counts below 100 cells/mm³.
  • Pulmonary involvement was the most common manifestation.

Conclusions:

  • Nocardiosis represents a significant opportunistic infection in advanced HIV disease.
  • Low CD4 counts (<100 cells/mm³) are a strong indicator for nocardiosis risk in HIV patients.
  • Pulmonary nocardiosis is a key clinical concern in this vulnerable population.

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