Moderate. Dyspnea, chest pain, chest tightness, and cough with a large amount of white foamy sputum occur after mild manual labor. Extensive moist rales are noted in the bilateral lower lung or unilateral lung on lung auscultation. The respiratory rate is >24 breaths/min while the heart rate is >110 beats/min and is accompanied by arrhythmia. Chest X-rays show patchy or flocculent shadows covering >1/2 of the lung, and CT scans show ground glasslike changes or nodule-like shadows. The white blood cell count and neutrophil count are slightly increased.