http://onlinelibrary.wiley.com/doi/10.1111/j.1398-9995.2009.01949.x/abstract
Allergy. 2009 Mar;64(3):322-34. Epub 2009 Feb 6.

Hypersensitivity pneumonitis.

BAL: CD8+ T lymphocytes, lymphocytosis

Many components of the extracellular matrix such as type III procollagen, hyaluronic acid, fibronectin, vibronectin and growth factors are involved in lung fibrosis and are increased in HP