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Infectious Disorders - Drug Targets

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ISSN (Print): 1871-5265
ISSN (Online): 2212-3989

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Research Article

Nocardia Infections: Ten Years Experience from a Tertiary Health Care Center in North India (2007-2016)

Author(s): Yashik Bansal, Nidhi Singla*, Hena Butta, Deepak Aggarwal, Neelam Gulati and Jagdish Chander

Volume 21, Issue 3, 2021

Published on: 16 May, 2020

Page: [445 - 451] Pages: 7

DOI: 10.2174/1871526520666200516161940

Price: $65

Abstract

Background: Nocardia species are important cause of infections in humans but are underreported due to missed diagnosis as well as misdiagnosis. Majority of the literature on these infections consists of case reports or series with few articles describing high number of cases.

Objective: To study the epidemiology of Nocardia infections in a tertiary care center.

Materials and Methods: This retrospective observational study was done in a tertiary care centre of North India over a period of 10 years (2007-2016). The detection of Nocardia spp. from clinical specimens was done by conventional methods viz. direct microscopy (Gram’s stain, modified Ziehl -Neelsen stain [1%], KOH examination) and culture.

Results: A total of 25 cases of nocardiosis were diagnosed during the study period. The mean age of the patients was 50.9 years (range 30-72 years) with a male:female ratio of 3:2. The site of disease in these patients included pulmonary (n=18), cutaneous (n=4), perinephric abscess (n=1), ocular (n=1) and bone (n=1). Risk factors associated were underlying lung disease (n=11), smoking (n=7), diabetes (n=5) and steroid therapy (n=4) in pulmonary nocardiosis, iatrogenic (n=1) and leprosy (n=1) in cutaneous nocardiosis, diabetes in perinephric abscess and cataract surgery in ocular nocardiosis. Culture was positive in 12/25 (48%) patients for Nocardia spp. Direct microscopy was positive in 22 patients. We wish to highlight that meticulous observation of KOH wet mount examination helped in clinching the diagnosis of Nocardiosis in 3 cases which were earlier missed by other methods.

Conclusion: Good communication with the clinician alongside a meticulous effort in the laboratory is essential for appropriate diagnosis and management of these cases.

Keywords: Nocardia, actinomycetes, pulmonary nocardiosis, mycetoma, sputum, KOH.

Graphical Abstract

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