Acute extrinsic allergic alveolitis after indicative challenge by mouldy hay. The figure shows a summary of the clinical diagnostic findings of the patient described as case 1. Clinical evidence: Several hours post challenge, fever, malaise, cough, associated with a restrictive ventilation pattern, and impaired gas exchange. The data shows lung function and other clinical findings in a time scale after the challenge [h]: f: Vital capacity VC [L], e: Pa,O2 arterial oxygen pressure [mmHg], d. Diffusion capacity/transfer coefficient for carbon monoxide (TL,CO) factor [mL/min*kPa], c: Specific airway resistance (sRaw) measured by whole body plethysmography [kPa*s]; Further parameter shown are: b: Temperature profile gradation [°C], a. Blood leukocytes counts *1000/mm3].