20th February 2025

A 47-year-old farmer presents with 6 months of weight loss, gradual-onset dyspnoea and fatigue.

A 47-year-old farmer presents with 6 months of weight loss, gradual-onset dyspnoea and fatigue.  His past medical history includes osteoarthritis for which he takes ibuprofen when symptoms are particularly affecting him. He is a non-smoker and has no pets.

His CXR shows a reticular pattern of fibrosis with honeycombing in the upper lobes.

Exposure to which organism is likely to be responsible for his deterioration?

Select the SINGLE most appropriate option from the list below. Select ONE option only.