Nocardiosis in a patient with common variable immunodeficiency

Area of Science:

• Immunology
• Infectious Diseases
• Microbiology

Background:

• Common variable immunodeficiency (CVID) is a primary immunodeficiency characterized by low immunoglobulin levels, increasing susceptibility to infections.
• Nocardiosis is a rare bacterial infection caused by Nocardia species, often opportunistic in immunocompromised individuals.

Observation:

• A 42-year-old male with undiagnosed CVID presented with multifocal symptoms including arthritis, subcutaneous abscesses, and pleural effusion.
• Laboratory findings revealed markedly decreased serum IgG, IgA, and IgM levels, confirming CVID.
• Nocardia asteroides was identified in pleural fluid cultures, establishing the diagnosis of nocardiosis.

Findings:

• The patient's CVID diagnosis was established concurrently with the presentation of nocardiosis.
• Infection with Nocardia asteroides was confirmed through microbiological culture of pleural fluid.
• Successful treatment was achieved using a combination of intravenous immunoglobulin and cotrimoxazole.

Implications:

• This case highlights the importance of considering opportunistic infections like nocardiosis in patients with CVID.
• Early diagnosis and appropriate management, including immunoglobulin replacement and targeted antibiotics, are crucial for favorable outcomes in CVID patients with nocardiosis.
• The successful treatment underscores the efficacy of combined immunomodulatory and antimicrobial therapy.