A Rare Case of Concurrent Nocardiosis and COVID-19 in a Patient with Severe Bronchial Asthma

Nocardiosis, a rare opportunistic infection caused by Nocardia spp., primarily affects immunocompromised individuals. We present a 65-year-old male with severe bronchial asthma and type 2 diabetes mellitus, who presented with recurrent hospitalizations due to persistent fever, progressive dyspnea, and pleuritic chest pain. Despite empiric broad-spectrum antibiotic therapy, diagnostic delays occurred because clinical and radiological features overlapped with those of other pulmonary pathologies. During hospitalization for concurrent COVID-19 infection, Nocardia farcinica was identified in a subsequent bronchial aspirate via modified acid-fast staining and Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS) analysis. The patient achieved clinical and radiological improvement following targeted antimicrobial therapy (Linezolid + Trimethoprim-Sulfamethoxazole + Amikacin) before discharge. This case highlights the critical importance of considering nocardiosis in patients with chronic respiratory comorbidities, particularly when overlapping infections such as COVID-19 are present, to mitigate diagnostic delays and optimize outcomes.