MRCP2-4260

MRCP2-4260

A 50-year-old man presents to the emergency department with a two-week history of a dry cough, fever and retrosternal discomfort. He has a past medical history of HIV and is poorly compliant with anti-retroviral medications. He has recently returned from a holiday in Mississippi.

Observations:

Heart rate 95 beats per minute
Blood pressure 101/65 mmHg
Respiratory rate 24/minute
Spo2 93% on room air
Temperature 37.3C

The examination is unremarkable.

A chest x-ray demonstrates multifocal consolidation that extends to the periphery of the lungs.

Sputum microscopy reveals yeasts.

What is the most likely organism responsible for this presentation?