[A case of Streptomyces pneumonia]

Area of Science:

• Medicine
• Infectious Diseases
• Pulmonology

Background:

• Streptomyces are filamentous bacteria known to cause opportunistic infections, primarily in immunocompromised individuals.
• Lung infections caused by Streptomyces are uncommon and often present with non-specific symptoms.

Observation:

• An 85-year-old man with a history of gastrectomy presented with persistent fever and fatigue.
• Chest X-ray revealed an infiltrative shadow with cavitation that did not respond to antibiotic treatment.
• Transcutaneous needle aspiration of the lung lesion identified Streptomyces as the causative agent.

Findings:

• A definitive diagnosis of pulmonary Streptomyces infection was established.
• This represents the first reported case of lung infection by Streptomyces in Japan.
• The patient lacked typical predisposing factors such as immunosuppression, making the case unusual.

Implications:

• This case underscores the importance of considering rare pathogens like Streptomyces in the differential diagnosis of cavitary lung lesions, even in non-immunocompromised patients.
• It highlights the need for prompt and accurate diagnosis through invasive procedures when standard treatments fail.
• Further research may be warranted to understand the epidemiology and risk factors for Streptomyces lung infections in diverse populations.