Symptoms in respiratory system were obvious; damages in lung ventilatory function was not serious; morbidity of complications especially tuberculosis was low.
呼吸系统症状明显，肺通气功能损害不严重，并发症尤其肺结核发病率低。
In patients with chronic poisoning is usually given to high-dose corticosteroids can reduce symptoms, but it was not obvious to improve the pathological changes.
在慢性中毒的患者，通常给予大剂量皮质类固醇，可减轻症状，但对病理变化改善不明显。
The difference on clinical symptoms in patients caused by the infection of VP with different etiology characteristics was not obvious.
不同病原学特征的VP引起的患者临床症状无明显差别。
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