Mycobacterium fortuitum Infection Presenting as Community-acquired Pneumonia in an Immunocompetent Host.

Mycobacterium fortuitum is a rapidly growing environmental mycobacteria, frequently isolated from water, dust, and soil, which commonly causes infection in the presence of underlying disease or immunosuppression. Skin, soft tissue, and bones are important sites of M. fortuitum, but it may colonize in the respiratory tract as well. We report the case of an otherwise healthy man who presented with signs and symptoms of community-acquired pneumonia. He was diagnosed as having primary infection with M. fortuitum and treated with multidrug antibacterial therapy. Our case confirms that M. fortuitum poses a threat not only to patients with immune defects but also to immunocompetent hosts. Flexible bronchoscopy or a transthoracic needle aspiration may be required to confirm the diagnosis.