Coccidioidomycosis in an Immunocompetent Host During the COVID-19 Era

Introduction: Coccidioides immitis and posadasii are dimorphic fungi endemic to the southwestern United States. Most immunocompetent hosts who contract coccidioidomycosis will clear the infection without symptoms. We detail the case of an immunocompetent, 56-year-old female who presented with symptoms of lower respiratory tract infection and concern for COVID-19 infection given significant exposure history. Case Description: The patient was referred to our advanced lung disease center (located in the southwestern United States) for subacute, productive cough associated with clear-yellow phlegm, dyspnea on exertion, infrequent night sweats, and abnormal chest x-ray (Figure A). The patient denied any history of fever, chills, hemoptysis, unintentional weight loss, or chest pain. Six-weeks prior to admission, the patient had significant exposure to multiple symptomatic persons with COVID-19. Two RT-PCR tests for COVID-19 to date were ruled negative, and a third test performed on admission was also negative. Computed tomography of the chest revealed right upper lobe cavitary consolidation with surrounding nodules bilaterally (Figure B). Sputum smear was negative for acid-fast bacillus or other bacterial organisms, prompting a bronchoscopy with bronchoalveolar lavage. Results demonstrated fungal cultures of Coccidioides immitis/posadasii. The patient also had significant IgG antibodies against Coccidioides species. She was started on therapeutic doses of fluconazole with a gradual improvement in symptoms. Discussion: History of significant exposure to COVID-19 warrants prompt and thorough investigation for disease status. Nonetheless, clinicians should still maintain a high suspicion and vigilance for excluding other, potentially treatable infectious etiologies, even regional endemic fungal infections that tend to manifest without symptoms.