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Nocardiosis (Nocardia Infection)

Aerobic actinomycete infection causing pulmonary, cutaneous, and disseminated disease in immunocompromised hosts.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Internal Medicine department. Book Appointment →

What is Nocardiosis (Nocardia Infection)?

Nocardiosis is a localized or disseminated infection caused by Nocardia spp., aerobic gram-positive branching bacilli with partial acid-fast staining. Over 100 species exist, with Nocardia farcinica, N. nova complex, N. brasiliensis, and N. asteroides complex being the most clinically relevant. Acquisition is via inhalation, direct inoculation through skin trauma, or rarely ingestion.

Pulmonary nocardiosis is the most common form, presenting as nodules, cavities, consolidation, or empyema. CNS dissemination occurs in 25-44% of pulmonary cases — solitary or multiple brain abscesses with characteristic ring enhancement. Cutaneous and lymphocutaneous infection (mycetoma in tropical regions) follows direct inoculation.

Major risk factors include solid organ transplantation, hematopoietic stem cell transplantation, glucocorticoid therapy, advanced HIV, and chronic granulomatous disease. Diagnosis requires culture (slow-growing, aerobic), modified acid-fast stain, MALDI-TOF, or 16S rRNA sequencing for species identification. Sulfonamides (TMP-SMX) form the backbone, often combined with imipenem, amikacin, or linezolid for severe or CNS disease, with prolonged therapy of 6-12 months.

Symptoms

Subacute or chronic cough
Fever, chills, night sweats
Pleuritic chest pain
Hemoptysis
Dyspnea
Weight loss, fatigue
Cutaneous nodules, ulcers, or sinuses
Lymphadenopathy along arm or leg (sporotrichoid)
Headache, focal neurologic deficits (CNS abscess)
Seizures
Confusion, altered mental status
Abscess at any organ (kidney, joint, bone)
Mycetoma (chronic foot or hand swelling with discharging sinuses)
Endophthalmitis after eye trauma
Skin lesions over disseminated immunosuppressed host

Risk Factors

Solid organ transplantation (heart, kidney, lung, liver)
Hematopoietic stem cell transplantation
Long-term glucocorticoid therapy
Tumor necrosis factor inhibitors
Advanced HIV (CD4 below 100)
Chronic granulomatous disease
Lymphoma, leukemia
Diabetes mellitus
Alcoholism
COPD with bronchiectasis
Chronic kidney disease
Cushing syndrome
Soil contact, gardening (cutaneous)
Tropical residence (mycetoma)
Recent skin trauma or surgery

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Persistent productive cough in immunosuppressed patient
  • Fever with cavity or nodule on chest CT
  • New neurologic symptom in transplant recipient
  • Non-healing skin lesion in immunosuppressed
  • Foot or hand mycetoma (sporotrichoid lymphangitis)
  • Recurrent abscess at any site
  • Persistent fever despite empiric antibiotics
  • TMP-SMX prophylaxis adherence concerns
  • Suspected ring-enhancing brain lesion in immunosuppressed
  • Eye trauma followed by progressive eye infection

Treatment Methods

01
Infectious diseases consultation
02
Chest CT to define pulmonary involvement
03
Brain MRI in all confirmed nocardiosis to rule out CNS abscess
04
Image of all organs in immunosuppressed patient (full body imaging)
05
Cultures: respiratory secretions, biopsy, abscess aspirate, blood
06
Modified Ziehl-Neelsen, Gram stain, MALDI-TOF, 16S rRNA
07
Susceptibility testing: TMP-SMX, amikacin, ceftriaxone, imipenem, linezolid, moxifloxacin
08
Initial empiric therapy: TMP-SMX (15 mg/kg/day TMP component) plus imipenem plus amikacin in severe disease
09
CNS or disseminated disease: TMP-SMX plus imipenem plus amikacin or linezolid for at least 4-6 weeks IV, then oral switch
10
Cutaneous or single pulmonary lesion: oral TMP-SMX monotherapy
11
Monitor TMP-SMX serum levels (target trough 100-150)
12
Linezolid for sulfa-allergic or resistant organisms
13
Source control: drain abscesses surgically
14
Treat for 6-12 months total (longer in CNS or immunosuppressed)
15
Reduce immunosuppression as feasible (transplant context)
16
Brain MRI follow-up at 1, 3, 6 months
17
Adverse drug effects: monitor BUN/Cr, CBC, LFTs
18
Linezolid toxicity: cytopenias, neuropathy, lactic acidosis
19
TMP-SMX prophylaxis after solid organ transplant reduces recurrence
20
Patient education on adherence, sun protection, hydration
21
Evaluate underlying immunodeficiency in non-transplant cases (CGD, HIV)
22
Long-term follow-up for relapse

Which Department to Visit?

You can visit our Enfeksiyon Hastalıkları department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.