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粮谷尘为混合性粉尘，含游离ＳｉＯ２９．７７％，分离培养出普通高温放线菌。染尘动物肺脏早期病变主要为小灶性肺泡炎、灶性间质性肺炎、异物肉芽肿等，大、中支气管壁脱颗粒肥大细胞增多。９０ｄ以后，上述病变明显减少，但逐渐出现少数小的细胞结节，间质轻度纤维组织增生、支气管慢性炎症和小叶中央型肺气肿样病变，观察１ａ（年）未见明显纤维化。
Grain and dust for the mixed dust, containing free SiO29.77%, isolated and cultured ordinary high temperature actinomycetes. Dust animal lung lesions mainly early small focal alveolitis, focal interstitial pneumonia, foreign body granuloma, large, middle bronchial wall degranulation mast cells increased. After 90 days, the above lesions were significantly reduced, but a small number of small cell nodules, mild interstitial fibrosis, chronic bronchial inflammation and lobular central emphysema-like lesions gradually appeared. No significant fibrosis was observed in 1a (years).