Rhodococcus equi infection after lung transplantation

Area of Science:

• Medical Microbiology
• Pulmonology
• Transplant Surgery

Background:

• Rhodococcus equi is an opportunistic pathogen increasingly recognized in immunocompromised patients.
• Lung transplant recipients are particularly vulnerable due to altered cell-mediated immunity post-transplantation.
• Risk factors include immunosuppression (e.g., corticosteroids) and potential environmental exposures.

Observation:

• A lung transplant recipient presented with constitutional symptoms including weight loss, cough, dyspnea, and somnolence.
• Computed tomography revealed a pulmonary nodule and pleural abnormalities in the transplanted lung.
• Infection with Rhodococcus equi was confirmed as the cause of the observed pathology.

Findings:

• The patient's immunosuppressed state, exacerbated by high-dose corticosteroids for acute allograft rejection, predisposed them to Rhodococcus equi infection.
• The clinical presentation and imaging findings were consistent with a severe pulmonary infection.
• Successful treatment involved a combination of intravenous vancomycin and subsequent oral ciprofloxacin monotherapy.

Implications:

• This case underscores the importance of considering Rhodococcus equi in the differential diagnosis of pulmonary infections in immunocompromised patients, especially lung transplant recipients.
• Prompt diagnosis and appropriate antimicrobial therapy are crucial for favorable outcomes.
• Management strategies may involve combination therapy followed by long-term suppressive treatment.