Figure 1.

Agents causing extrinsic allergic alveolitis, specific inhalative challenge testing, and bronchoalveolar lavage cells. A. Mouldy hay causing farmer’s lung disease in the subject shown in Figure 1D and Figure 4 B. Bronchoalveolar lavage with extensive neutrophilia present six hours post challenge in an subject with pigeon breeder’s lung. C. Water and sediment of a humidifier water of a printing plant (of the subject shown in Figure 3). Microscopic examinations demonstrated a variety of bacteria and moulds in this specimen. D. Occupational type specific inhalative challenge test with mouldy hay (Figure 1A).