Arxula adeninivorans causing invasive pulmonary mycosis and fungaemia in cystic fibrosis

Phenotypical and molecular methods identified the yeast as Arxula adeninivorans (figure), which is used in biotechnology3 as a transgenic organism and not previously identified as a pathogen. Because A adeninivorans is used in the production of coffee and tea, we screened the patient's household but did not find this yeast. Rare fungi such as scedosporium,4 exophiala, and A adeninivorans can be difficult to detect; in this case, the fungus was first misidentified as Stephanoascus ciferii.